XI Chemistry - Karachi Board MCQs

Five Year Papers

1. The process in which a solid directly changes to vapours without melting is called __________.

(Evaporation, Condensation, Sublimation)

2. The oxidation number of P in PO3-4 is __________.

(3+, 5+, 3-)

3. The pH of 0.001 M HCl is __________.

(2, 4, 3)

4. K ( rate constant) is dependent on __________.

(temperature, concentration, volume)

5. The universal indicator in water shows the colour __________.

(red, green, blue)

6. The pH of blood is __________.

(7.3, 8.4, 5.6)

7. The oxidation potential of hydrogen electrode is __________.

(0.0 volt, +0.76volt, -0.36volt)

8. __________ quantum number describes the shape of a molecule.

(Pricipal, Azimuthal, Spin)

9. An orbital can have the maximum number of two electrons but with opposite spin, it is called __________.

(Pauli’s Exclusion Principle, Hund’s Rule, Aufbau Principle)

10. When a-particle is emitted from the nucleus of radioactive element, the mass number of the atom __________.

(Increases, Decreases, Does not change)

11. Dissociation of KclO3 is a __________ process.

(Reversible, Irreversible)

12. The e/m ratio of cathode rays is the __________ when Hydrogen is taken in the discharge tube.

(Lowest, Highest)

13. The negative ion tends to expand with the __________ of negative change on it.

(Decreases, Increases)

14. Ionic compounds have __________ melting points.

(Low, High)

15. The allotropic forms of an element are called __________.

(Polymorphs, Isomorphs)

16. Absolute Zero is equal to __________.

(273.16°C, -273.16°C)

17. The compounds having hydrogen bond generally have __________ boiling points.

(High, Low)

18. Surface tension __________ with the rise of temperature.

(Increases, Decreases)

19. Mercury forms __________ meniscus in a glass tube.

(concave, convex)

20. The reactions with the high value of energy of activation are __________.

(slow, fast)

21. 2.000 has/have __________ significant figure(s).

(1, 4)

22. E + PV is called __________.

(Entropy, Enthalpy)

23. The shorter the bond length in a molecule, the __________ will be bond energy.

(Lesser, Greater)

24. Positive rays are produced from __________.

(anode, Cathode, Ionization of gas in a discharge tube)

25. __________ of the following contains the fewer number of molecules.

(1 gm of hydrogen, 4 gm of oxygen, 2 gm of nitrogen)

26. the true statement about the average speed of the molecules of hydrogen, oxygen and nitrogen confined in a container is __________.

(Hydrogen is quicker, Oxygen is quicker, The molecules of all the gases have the same average speed)

27. The correct statement about the glass is __________.

(It is crystalline solid, Its atoms are arranged in an orderly fashion, It is a super cooled liquid)

28. When a substance that has absorbed energy emits it in the form of radiation the spectrum obtained is __________.

(Continuous Spectrum, Line Spectrum, Emission Spectrum)

29. __________ of the overlap forms strong bond.

(S-S, P-S, P-P)

30. __________ compound has a greater angle between a covalent bond.

(H2O, NH3, CO2)

31. When sodium chloride is mixed in water then __________.

(pH is changed, NaOH and HCl are formed, Sodium and chloride ions become hydrated)

32. The boiling point of a liquid __________ with an increase in pressure.

(Decreases, Increases, remains constant)

33. An Azimuthal Quantum Number describes the __________.

(size of an atom, shape of an orbital, spin of orbital)

34. The rate of the backward reaction is directly proportional to the product of the molar concentration of __________.

(Reactants, Products, None of them)


Chapter 1

Introduction To Fundamental Concepts




1. The formula, which gives the simple ratio of each kind of atoms present in the molecule of compound, is called __________.

(Molecular Formula, Empirical Formula, Structural Formula)

2. The formula, which expresses the actual number of each kind of atom present in the molecule of a compound, is called __________.

(Empirical Formula, Molecular Formula, Structural Formula)

3. Mole is a quantity, which has __________ particles of the substance.

(One billion, 6.02 x 1023, 1.013 x 105)

4. The simplest formula of a compound that contain 81.8% carbon and 18.2% hydrogen is __________.

(CH3, CH, C2H6)

5. The empirical Formula of a compound __________.

(is always the same as the molecular formula, Indicates the exact composition, Indicates the simplest ratio of the atoms)

6. Very small and very large quantities are expressed in terms of __________.

(significant figures, Exponential Notation, Logarithm)

7. Two moles of water contains __________ molecules.

(6.02 x 1023, 1.204 x 1024, 3.01 x 1023)

8. One mole of Cl- ions contains __________ ions.

(6.02 x 1023, 1.204 x 1024, 3.01 x 1023)

9. 220 gms of CO2 contains __________ moles of CO2.

(One, Five, Ten)

10. In rounding off __________ figure is dropped.

(First, Last, No)

11. Precision is linked with __________.

(Individual measurements, Actual results, Accepted Value)

12. Accuracy refers to how closely a measured value agrees with __________.

(Individual result, Actual result, Average value)

13. 6600 contains __________ significant figures.

(2, 3, 4)

14. 3.7 x 104 contains __________ significant figures.

(2, 3, 5)

15. 9.40 x 10-19 contains __________ significant figures.

(2, 3, 5)

16. The figure 39.45 will be rounded off to __________.

(39.4, 39.5, 39)

17. __________ means that the result obtained in different experiments are very close to the accepted values.

(Accuracy, Precision, Significant Figure)

18. The average weight of atoms of an element as compared to the weight of one atom of carbon taken as __________ is called the atomic weight.

(12, 13, 14)

19. 58.5 is __________ of NaCl.

(Atomic weight, Formula Weight, Molecular Weight)

20. 18.0 a.m.u is the __________ weight of water.

(Atomic, Formula, Molecular)

21. 28 gms of nitrogen will have __________ molecules.

(6.02 x 1023, 12.04 x 1023, 3.01 x 1023)

22. 22.4 dm3 of CO2 is __________ 22.4 dm3 of SO2.

(Heavier than, Lighter than, Equal to)

23. 100 gms of water is equal to __________ moles.

(5.56, 27.78, 6.25)

24. The reactions, which proceed in both the directions are called __________ reactions.

(Reversible, Irreversible, Neutrilization)

25. The reactions, which proceed in forward direction only are called __________ reactions.

(Reversible, Irreversible, Ionic)

26. Molecular weight is used for __________ substances.

(Ionic, Non ionic, Neutral)

27. Formula weight is used for __________ substances.

(Ionic, Non ionic, Neutral)

28. The modern system of measurement is called __________ system.

(SI, Metric, F.P.S)

29. The S.I unit of mass is __________.

(kilogram, gram, pound)

30. One mole of glucose contains __________ gms.

(100, 180, 342)

Chapter 2

The Three States of Matter

1. __________ was the first scientist who expressed a relation between pressure and the volume of a gas.

(Charles, Boyle, Avogadro)

2. If the pressure upon a gas confined in a vessel varies, the temperature remaining same, the volume will __________.

(Vary directly as the pressure, Vary inversely as the temperature, Vary inversely as the pressure)

3. The statement concerning the relation of temperature to the volume of a gas under fixed pressure was first synthesized by __________.

(Boyle, Charles, Avogadro)

4. Absolute Zero is __________.

(273°C, -273°C, -273°K)

5. Gases intermix to form __________.

(Homoge\= ous mixture, Heterogenous mixture, compound)

6. Water can exists in __________ physical states at a certain condition of temperature pressure.

(One, Two, three)

7. The temperature at which the volume of a gas theoretically becomes zero is called __________.

(Transition temperature, Critical Temperature, Absolute Zero)

8. Gases deviate from ideal behaviour at __________ pressure and __________ temperature.

(Low, High, Normal)

9. Very low temperature can by produced by the __________ of gases.

(Expansionn, Contraction, Compression)

10. Boiling point of a liquid __________ with increase in pressure.

(increases, decreases, remains same)

11. 273°K = __________

(100°C, 273°C, 0°C)

12. -273°C is equal to __________.

(0°K, 273°K, 100°K)

13. Evaporation takes place at __________.

(All temperatures, At constant temperature, at 100°C)

14. __________ is the temperature at which the vapour pressure of a liquid becomes equal to atmospheric pressure.

15. The freezing point of water in Fahrenheit scale is __________.

(0°F, 32°F, 212°F)

16. All gases change to solid before reaching to __________.

(-100°C, 0°C, -273°C)

17. Pressure of the gas is due __________ of the molecules on the wall of the vessel.

(Collisionns, Attraction, Repulsion)

18. Boiling point of water in absolute scale is __________.

(212°K, 100°K, 373°K)

19. Boyle’s Law relates __________.

(Pressure and volume, Temperature and volume, Pressure and temperature)

20. Charles Law deals with __________ relationship.

(temperature and volume, pressure and volume, temperature and pressure)

21. Effusion is the escape of gas through __________.

(A small pin hole, Semi permeable membrane, porous container)

22. The expression P = P1 + P2 + P3 represents __________ mathematically.

(Graham’s Law, Avogadro’s Law, Dalton’s law of partial Pressure)

23. According to __________ equal volumes of all gases at the same temperature and pressure contain equal number of molecules.

(Graham’s Law, Avogadro’s Law, Dalton’s Law)

24. The boiling point of pure water is __________.

(32°C, 100°F, 373°K)

25. The internal resistance of a liquid to flow is called __________.

(Surface tension, Capillary action, Viscosity)

26. The existence of different crystals forms of the same substance is called __________.

(Isomorphism, Polymorphism, Isotopes)

27. Rate of Evaporation __________ on increasing temperature.

(Increases, Decreases, Remains same)

28. The temperature at which more than one crystalline forms of a substance coexist is called the __________.

(Critical Temperature, Transition Temperature, Absolute Temperature)

29. The gases which strictly obey the gas laws are called __________.

(Ideal gases, Permanent gases, Absolute gases)

30. Lighter gas diffuse __________ than the heavier gases.

(More readily, Less readily, Very slowly)

Chapter 3

Structure of Atom

1. The charge on an electron is __________.

(-2.46 x 104 coulombs, -1.6 x 10-19 coulombs, 1.6 x 10-9coulombs)

2. The maximum number of electrons that can accommodated by a p-orbital is __________.

(2, 6, 10)

3. A proton is __________.

(a helium ion, a positively charged particle of mass 1.67 x 10-27 kg, a positively charged particle of mass 1/1837 that of Hydrogen atom)

4. Most penetrating radiation of a radioactive element is __________.

(a-rays, b-rays, g-rays)

5. The fundamental particles of an atom are __________.

(Electrons and protons, electrons and neutrons, Electrons, Protons, Neutrons)

6. The fundamental particles of an atoms are __________.

(the number of protons, The number of neutrons, The sum of protons and neutrons)

7. “No two electrons in the same atoms can have identical set of four quantum numbers.” This statement is known as __________.

(Pauli’s Exclusion Principle, Hund’s rule, Aufbau Rule)

8. __________ has the highest electronegativity value.

(Fluorine, Chlorine, Bromine)

9. Principle Quantum number describes __________.

(Shape of orbital , size of the orbital, Spin of electron in the orbital)

10. Canal rays are produced from __________.

(Anode, Cathode, Ionization of gas in the discharge tube)

11. Electromagnetic radiation produce from nuclear reactions are known as __________.

(a-rays, b-rays, g-rays)

12. Cathode rays consist of __________.

(Electorns, Protons, Positrons)

13. The properties of cathode rays __________ upon the nature of the gas inside the tube.

(depend, partially depend, do not depend)

14. Anode rays consists of __________ particles.

(Negative, Positive, Neutral)

15. Atomic mass of an element is equal to the sum of __________.

(electrons and protons, protons and neutrons, electrons and neutrons)

16. Neutrons were discovered by __________.

(Faraday, Dalton, Chadwick)

17. The value of Plank’s constant is __________.

(6.626 x 10-34, 6.023 x 1024, 1.667 x 10-28)

18. P-orbitals are __________ in shape.

(spherical, diagonal, dumb bell)

19. The removal of an electron from an atom in gaseous state is called __________.

(Ionization energy, Electron Affinity, Electronegativity)

20. The energy released when an electron is added to an atom in the gaseous state is called __________.

(Ionization Potential, electron Affinity, Electronegativity)

21. The power of an atom to attract a shared pair of electrons is called __________.

(Ionization Potential, Electron Affinity, Electronegativity)

22. Electronegativity of Fluorine is arbitrarily fixed as __________.

(2, 3, 4)

23. The energy difference between the shells go on __________ when moved away from the nucleus.

(Increasing, decreasing, equalizing)

24. __________ discovered that the nucleus of an atom is positively charged.

(William Crooke’s, Rutherford, Dalton)

25. Isotopes are atoms having same __________ but different __________.

(Atomic weight, Atomic number, Avogadro’s Number)

26. __________ consists of Helium Nuclei or Helium ion (He++).

27. The angular momentum of an electron revolving around the nucleus of atom is __________.

(nh/2p, n2h2/2p, nh3/3p)

28. The wavelengths of X-rays are mathematically related to the __________ of anticathode element.

(atomic weight, atomic number, Avogadro’s number)

29. Lyman Series of spectral lines appear in the __________ portion of spectrum.

(Ultraviolet, Infra red, Visible)

30. According to __________ electrons are always filled in order of increasing energy.

(Pauli’s Exclusion Principle, Uncertainty Principle, Aufbau Principle)


Chapter 4

Chemical Bonding

1. The energy required to break a chemical bond to form neutral atoms is called __________.

(Ionization Potential, Electron Affinity, Bond Energy)

2. The chemical bond present in H-Cl is __________.

(Non Polar, Polar Covalent, Electrovalent)

3. A polar covalent bond is formed between two atoms when the difference between their E.N values is __________.

(Equal to 1.7, less than 1.7, More than 1.7)

4. The most polar covalent bond out of the following is __________.

(H-Cl, H-F, H-I)

5. __________ bond is one in which an electron has been completely transferred from one atom to another.

(Ionic, Covalent, co-ordinate)

6. __________ bond is one in which an electron pair is shared equally between the two atoms.

(Ionic, Covalent, Co-ordinate)

7. Bond angle in the molecule of CH4 is of __________.

(120°, 109.5°, 180°)

8. A molecule of CO2 has __________ structure.

9. The sigma bond is __________ than pi bond.

(Weaker, Stronger, Unstable)

10. The sp3 orbitals are __________ in shape.

(Tetrahedral, Trigonal, Diagonal)

11. The shape of CH4 molecule is __________.

(Tetrahedral, Trigonal, Diagonal)

12. The bond in Cl2 is __________.

(Non polar, Polar, Electrovalent)

13. Water is __________ molecule.

(None polar, Polar, Electrovalent)

14. Covalent bonds in which electron pair are shared equally between the two atoms is called __________ covalent bond.

(Non polar, Polar, Co-ordinate)

15. Each carbon atom in CH4 is __________ hybridized.

(Sp3, Sp2, Sp)

16. Each carbon atom in C2H4 is __________ hybridized.

(Sp3, Sp2, Sp)

17. Each carbon atom in C2H2 is __________ hybridized.

(Sp3, Sp2, Sp)

18. Oxygen atom in H2O has __________ unshared electron pair.

(One, two , three)

19. Nitrogen atom in NH3 has __________ unshared electron pair.

(One, two, three)

20. The cloud of charge that surrounds two or more nuclei is called __________ orbital.

(Atomic, Molecular, Hybrid)

21. A substance, which is highly attracted by a magnetic field, is called __________.

(Electromagnetic, Paramagnetic, Diamagnetic)

22. HF exists in liquid due to __________.

(Vander Waal Forces, Hydrogen bond, covalent Bond)

23. Best hydrogen bonding is found in __________

(HF, HCl, HI)

24. Shape of CCl4 molecule is __________.

(tetrahedral, Trigonal, Diagonal)

25. __________ bond is formed due to linear overlap.

(Sigma bond, Pi bond, Hydrogen bond)

26. __________ is defined as the quantity of energy required to break one mole of covalent in gaseous state.

(Bond energy, Ionization energy, Energy of Activation)

27. Repulsive force between electron pair in a molecule is maximum when it has an angle of __________.

(120°, 109.5°, 180°)

28. Repulsive force between electron pair in a molecule is maximum when it has an angle of __________.

(120°, 109.5°, 180°)

29. The sum of total number of electrons pairs (bonding and lone pairs) is called __________.

(Atomic Number, Avogadro’s Number, Steric Number)

30. Shape of __________ molecule is tetrahedral.

(BaCl2, BF3, NH3)

Chapter 5

Energetics of Chemical Reaction

1. The quantity of heat evolved or absorbed during a chemical reaction is called __________.

(Heat or Reaction, Heat of Formation, Heat of Combination)

2. An endothermic reaction is one, which occurs __________.

(With evolution of heat, With absorption of Heat, In forward Direction)

3. An exothermic reaction is one during which __________.

(Heat is liberated, Heat is absorbed, no change of heat occurs)

4. The equation C + O2 ® CO2 DH = -408KJ represents __________ reaction.

(Endothermic, Exothermic, Reversible)

5. The equation N2 + O2 ® 2NO DH = 180KJ represents __________ reaction.

(Endothermic, Exothermic, Irreversible)

6. Thermo-chemistry deals with __________.

(Thermal Chemistry, Mechanical Energy, Potential Energy)

7. Enthalpy is __________.

(Heat content, Internal energy, Potential Energy)

8. Hess’s Law is also known as __________.

(Law of conservation of Mass, Law of conservation of Energy, Law of Mass Action)

9. Any thing under examination in the Laboratory is called __________.

(Reactant, System, Electrolyte)

10. The environment in which the system is studied in the laboratory is called __________.

(Conditions, Surroundings, State)

11. When the bonds being broken are more than those being formed in a chemical reaction, then DH will be __________.

(Positive, Negative, Zero)

12. When the bond being formed are more than those being broken in a chemical reaction, then the DH will be __________.

(Positive, Negative, Zero)

13. The enthalpy change when a reaction is completed in single step will be __________ as compared to that when it is completed in more than one steps.

(Equal to, Partially different from, Entirely different from)

14. The enthalpy of a system is represent by __________.

(H, DH, DE)

15. The factor E + PV is known as __________.

(Heat content, Change in Enthalpy, Work done)

16. Heat of formation is represented by __________.

(Df, DHf, Hf)

17. The heat absorbed by the system at constant __________ is completely utilize to increase the internal energy of the system.

(Volume, Pressure, Temperature)

18. Heat change at constant __________ from initial to final state is simply equal to the change in enthalpy.

(Volume, Pressure, Temperature)

19. A system, which exchange both energy and energy with the surrounding, is __________ system.

(Open, Closed, Isolated)

20. A system, which only exchange energy with the surrounding but not the matter, is __________ system.

(Open, Closed, Isolated)

21. A system, which neither exchanges energy nor matter with the surroundings is __________ system.

(Open, Closed, Isolated)

22. __________ property of a system is independent of the amount of material concerned.

(Intensive, Extensive, Physical)

23. __________ property of a system depends upon the amount of substance present in the system.

(Intensive, Extensive, Physical)

24. DE = q – w represents __________.

(First Law of Thermodynamics, Hess’s Law, Enthalpy Change)

25. __________ is defined as the change in enthalpy when one gram mole of a compound is produced from its elements.

(Heat of Reaction, heat of Formation, Heat of Neutrilization)

Chapter 6

Chemical Equilibrium

1. At equilibrium the rate of forward reaction and the rate of reverse reaction are __________.

(Equal, Changing, Different)

2. Such reactions, which proceed to forward direction only and are completed after sometime are called __________ reaction.

(Irreversible, Reversible, Molecular)

3. Such reactions, which proceed to both the direction and are never completed, are called __________ reaction.

(Irreversible, Reversible, Molecular)

4. The rate of chemical reaction is directly proportional to the product of the molar concentration of __________.

(Reactants, Products, Both reactants and products)

5. “If a system in equilibrium is subjected to a stress, the equilibrium shifts in a direction to minimize or undo the effect of this stress. This principle is known as __________.

(Le-Chatelier’s Principle, Gay Lussac’s Principle, Avogadro’s Principle)

6. A very large value of Kc indicates that reactants are __________.

(very stable, unstable, moderately stable)

7. A very low value of Kc indicates that reactants are __________.

(very stable, very unstable, moderately stable)

8. The equilibrium in which reactants are products are in single phase is called __________.

(Homogenous Equilibrium, Heterogenous Equilibrium, Dynamic Equilibrium)

9. The equilibrium in which reactants and products are in more than one phases are called __________.

(Homogenious Equilibrium, Heterogenious Equilibrium, Dynamic Equilibrium)

10. Chemical Equilibrium is __________ equilibrium.

(Dunamic, Static, Heterogeneous)

11. In exothermic reaction, lowering of temperature will shift the equilibrium to __________.

(right, left, equally on both the direction)

12. In endothermic reaction, lowering of temperature will shift the equilibrium to __________.

(right, left, equally on both the direction)

13. A catalyst __________ the energy of activation.

(increases, decreases, has no effect on)

14. At equilibrium point __________.

(forward reaction is increased, backward reaction is increased, forward and backward reactions become equal)

15. NH3 is prepared by the reaction N2 + 3H2 Û 2NH3 DH = -21.9 Kcal. The maximum yield of NH3 is obtained __________.

(At low temperature and high pressure, at high temperature and low pressure, at high temperature and high pressure)

16. When a high pressure is applied to the following reversible process: N2 + O2 Û 2NO The equilibrium will __________

(shift to the forward direction, shift to the backward direction, not change)

17. The value of Kc __________ upon the initial concentration of the reaction.

(depends, partially depends, does not depend)

18. While writing the Kc expression, the concentration of __________ are taken in the numerator.

19. Solubility product constant is denoted by __________.

(Kc, Ksp, Kr)

20. “The degree of ionization of an electrolyte is suppressed by the addition of another electrolyte containing a common ion.” This phenomenon is called __________.

(Solubility Product, Common Ion Effect, Le-Chatelier’s Principle)

Chapter 7

Solutions and Electrolytes

1. Molarity is the number of moles of a solute dissolved per __________.

(dm3 of a solution, dm3 of solvent, Kg of solvent)

2. Molality is defined as the number of moles of solute dissolved per __________.

(dm3 of solution, kg of solvent, kg of solute)

3. The solubility of a solute __________ with the increase of temperature.

(increases, decreases, does not alter)

4. The loss of electron during a chemical reaction is known as __________.

(Oxidation, Reduction, Neutralization)

5. The gain of electron during a chemical reaction is known as __________.

(Oxidation, Reduction, Neutralization)

6. The ions, which are attracted towards the anode, are known as __________.

(Anins, Cations, Positron.

7. The pH of a neutral solution is __________.

(1.7, 7, 14)

8. A current of one ampere flowing for one minute is equal to __________.

(One coulomb, 60 coulomb, one Faraday)

9. A substance, which does not allow electricity to pass through, is known as __________.

(Insulator, Conductor, Electrolyte)

10. Such substances, which allow electricity to pass through them and are chemically decomposed, are called __________.

(Electrolytes, Insulators, Metallic conductors)

11. __________ is an example of strong acid.

(Acetic Acid, Carbonic Acid, Hydrochloric Acid)

12. __________ is an example of weak acid.

(Hydrochloric Acid, Acetic Acid, Sulphuric Acid)

13. When NH4Cl is hydrolyzed, the solution will be __________.

(Acidic, Basic, Neutral)

14. When Na2CO3 is hydrolyzed, the solution will be __________.

(Acidic, Basic, Neutral)

15. When blue hydrated copper sulphate is heated __________.

(It changes into white, it turns black, it remains blue)

16. Sulphur has the highest oxidation number in __________.

(SO2, H2SO4, H2SO3)

17. The reaction between an acid and a base to form a salt and water is called __________.

(Hydration, Hydrolysis, Neutralization)

18. __________ is opposite of Neutralization.

(Hydration, Hydrolysis, Ionization)

19. The substance having pH value 7 is __________.

(Basic, Acidic, Neutral)

20. An aqueous solution whose pH is zero is __________.

(Alkaline, Neutral, Strongly Acidic)

21. Solubility product of slightly soluble salt is denoted by __________.

(Kc, Kp, Ksp)

22. The increase of oxidation number is known as __________.

(Oxidation, Reduction, Hydrolysis)

23. The decrease of Oxidation number is known as __________.

(Oxidation, Reduction, Electrolysis)

24. One molar solution of glucose contains __________ gms of glucose per dm3 of solution.

180, 100, 342)
25. The number of moles of solute present per dm3 of solution is called __________.

(Molality, Molarity, Normality)

26. ‘M’ is the symbol used for representing __________.

(Molality, Molarity, Normality)

27. 1 mole of H2SO4 is equal to __________.

(98gms, 49gms, 180gms)

28. Buffer solution tends to __________ pH.

(Change, Increase, maintain)

29. The logarithm of reciprocal of hydroxide ion is represented as __________.

(pH, pOH, POH)

30. In __________ water molecules surround solute particles.

(Hydration, Hydrolysis, Neutralization)

Chapter 8

Introduction to Chemical Kinetics

1. The rate of chemical reaction __________ with increase in concentration of the reactants.

(Increases, Decreases, Does not alter)

2. Ionic reactions of inorganic compounds are __________.

(very slow, moderately slow, very fast)

3. The rate of __________ reactions can be determined.

(Very Slow, Moderately Slow, Very fast)

4. The sum of exponents of the concentrations of reactants is called __________.

(Order of reaction, Molecularity, Equilibrium Constant)

5. The rate of reaction generally __________ in the presence of a suitable catalyst.

(Increases, Decreases, remains constant)

6. The rate of a reaction __________ upon the temperature.

(depends, slightly depends, does not depends)

7. The minimum energy required to bring about a chemical reaction is called __________.

(Bond energy, Ionization energy, Energy of Activation)

8. Oxidation of SO2 in the presence of V2O5 in Sulphuric Acid industry is an example of __________.

(Homogenous catalyst, Heterogeneous catalyst, Negative catalyst)

9. Hydrolyses of ester in the presence of acid is an example of __________.

(Homogenous catalyst, Heterogeneous catalyst, Negative catalyst)

10. Concentration of the reactants __________ with the passage of time during a chemical reaction.

(Increases, Decreases, Does not alter)

11. Concentration of the products __________ with the passage of time during a chemical reaction.

(Increases, Decreases, Does not alter)

12. The rate constant __________ with temperature for a single reaction.

(Varies, Slightly Varies, Does not vary)

13. The rate of reaction at a particular time is called __________.

(Average Rate of reaction, Absolute rate of reaction, Instantaneous rate of reaction)

14. The specific rate constant K has __________ value for all concentrations of the reactant.

(Fixed, Variable, negligible value)

15. By increasing the surface area the rate of reaction can be __________.

(Increased, Decreased, Doubled)

16. MnO2 when heated with KClO3 __________.

(Gives up its own oxygen, Produces ozone O3, Acts as catalyst)

17. Reactions with high energy of activation proceed with __________.

(High speed, Moderately slow speed, slow speed)

18. The minimum amount of energy required to bring about a chemical reaction is called __________.

(Energy of ionization, Energy of Activation, Energy of Collision)

19. An inhibitor is a catalyst which __________ rate of reaction.

(Increases, Decreases, Does not alter)

20. __________ is the change of the concentration of reactant divided by the time.

(Rate of reaction, Velocity Constant, Molecularity)

Comments :

So far 1
Anonymous said...
pada hari 

its of 1st yr not class 9

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