Chemistry Mcq Questions For Class 11 Pdf Download Chapter 11 | Online Mcq Test For Class 11 Chemistry

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Chapter 11

Reaction Kinetics

1. Larger the surface area of the reactant molecules:

1. Lower will be the rate of reaction
2. Higher will be the rate of reaction
3. The rate of reaction remains unaffected
4. The rate may increase or decrease

2. In zero order reaction, the rate is independent of:

1. Temperature of reaction P ast P
2. Concentration of reactants
3. Concentration of product
4. None of these

3. The order of reaction of O₃ + NO → NO₂ + O₂ is:

1. One
2. Two
3. Three
4. Zero

4. Decomposition of nitrogen penta oxide has order of reaction:

1. Zero
2. First
3. Second
4. Third

5. A substance which retards the rate of reaction is called:

1. Inhibitor
2. Activator
3. Oxidant
4. Auto-Catalyst

6. The minimum amount of energy required for an effective collision is called:

1. Activation energy
2. Internal energy
3. Translational energy
4. None

7. The catalyst used for the reaction HCOOH → H₂+CO₂ is:

1. Copper
2. Alumina
3. Silica
4. Iron

8. Sugar solution hydrolyses to glucose and fructose in the presence of enzyme:

1. Urease
2. Invertase
3. Zymase
4. None

9. When a reaction proceeds in sequence of steps, the overall rate is determined by:

1. Faster step
2. Slowest step
3. Molecularity of all steps
4. Order of different step

10. A substance which makes the catalyst more effective is called:

1. Inhibitor
2. Retarder
3. Promoter
4. Auto Catalyst

11. If 75% of any given amount of radioactive element disintegrates in 60 minutes the half life of radioactive element is:

1. 20 minutes
2. 30 minutes
3. 40 minutes
4. 25 minutes

12. with increase of 10°C temperature, the rate of reaction becomes double. This increase in rate of reaction is due to:

1. Decrease in the activation energy of reaction
2. Decrease in number of collision between the molecules
3. Increase in activation energy of reactants
4. Increase in number of effective collision

13. The unit of rate constant for zero order reaction is:

1. dm³ S^-1
2. mole dm³S^-1
3. dm² mol ‘s^-1
4. mole S^-1

14. If the rate equation of reaction 2 A + B → Product

Rate = k [A]² [B] and A is present in large excess, then order of reaction is:

1. 1
2. 2
3. 3
4. None of these

15. The half life period of   ¹⁴₆ Cis 5760 years. 100mg of sample of ¹⁴₆Cis will reduce to 25mg in:

1.  11520 years
2. 2880 years
3. 57600 years
4. 5760 years

16. The energy of activated complex is:

1. Greater than the reactants and products
2. Less than the reactants and products
3. Equal to the products
4. Equal to the reactants

17. Indicate the enzyme which catalyses the following: C₆H₁₂O₆ →2C₂H₅OH + 2CO₂

1. Diastase
2. Zymase
3. Urease
4. Invertase

18. The rate of chemical reaction depends upon the nature of reactants because?

1. Some of the reactants have high boiling point
2. Some of the reactants are colored
3. Energy of activation differs from one reaction to another
4. Some of the reactants are solid at room temperature

19. Which of following is an example of homogenous catalysis?

1. Formation of ghee from oil
2. Formation of SO₃ in contact process
3. Hydrolysis of ester Hydrolysis
4. Formation of NH₃ in Haber process

20. In zero order reaction the rate is independent of:

1. Temperature of reaction
2. Concentration of products
3. Concentration of reactants
4. None of these

21. Hydrolysis of Tertiary butyl bromide has order of reaction:

1. First order
2. Pseudo first order
3. Second order
4. Third order

22. A substance which decreases the efficiency of a catalyst is called:

1. Promoter
2. Activator
3. Poison
4. Auto catalyst

23. Photo chemical reactions are:

1. First order
2. Third order
3. Second order
4. Zero order

24. The rate of chemical reaction is independent of:

1. Molecularity
2. Temperature
3. Nature of reactants
4. Concentration of reaction

25. The unit of rate constant for zero order reaction:

1. mol dm^-3s^-1
2. mol^-1dm³s^-1
3. dm³s^-1
4. mol s^-1

26. The energy of activation for a reaction by using catalyst is:

1. Increased
2. Decreased
3. Not changed
4. Moderate

27. Specific rate constant is equal to rate of reaction when concentrations of reactants are:

1. Zero
2. Four
3. Three
4. Unity

28. The equation K = Ae^-EaRT is called:

1. Rate law
2. Rate equation
3. Arrhenius equation
4. General gas equation