11th class (FSc) chemistry Unit 11 MCQs
Chapter 11 MCQs 11th Class Chemistry
Reaction Kinetics:
1. Velocity constant is the rate of reaction when the cone. of reaction are:
a. Two
b. Zero
c. Three
d. Unity
2. In zero order reaction, the rate is independent of:
a. Concentration of products
b. Temperature of reaction
c. Cobncentration of reactions
d. None of these
3. The unit of the rate constant for zero order reaction is:
a. dm3mol-1s-1
b. dm3 s-1
c. mol s-1
d. mol dm3 s-1
4. The unit of the rate constant is the same as that of the rate of reaction:
a. Third order reaction
b. First order reaction
c. Zero order reaction
d. Second order reaction
5. The order of decomposition of nitrogen pentoxide 2N2O5 → 2N2O4+O2 is:
a. Third order
b. First order
c. Zero order
d. Second order
6. All radioactive disintegration nuclear reaction are of:
a. Second
b. First
c. Third
d. Pseudo first
7. Hydrolysis of Tertiary butyl bromide has order of reaction:
a. Second
b. First
c. Third
d. Pseudo first
8. The order of the reaction for the reaction NO +O3 → NO2+O2 is:
a. One
b. Two
c. Zero
d. Three
9. Photosynthesis is:
a. Zero order
b. First order
c. Third order reaction
d. Second order
10. If 75% of any given amount of radioactive element distintegrantes in60 minutes, the half-life of radioactive element is:
a. 45 minutes
b. 20 minutes
c. 25 minutes
d. 30 minutes
11. The half life period of 146C is 5760 years 100mg of sample of 146 C will reduce to 25mg in:
a. 57600 years
b. 11520 years
c. 5760 years
d. 1880 years
12. Half-life of a second order reaction is inversely proportional to:
a. Initial concentration of products
b. Initial concentration of reactants
c. Final concentration of products
d. Final concentration of reactants
13. When a reaction is proceeds in a sequence of steps, the overall rate is determined by:
a. Molecularity of all steps
b. Fastest step
c. Order of different steps
d. Slowest step
14. The optical activity is measured by:
a. Polarimeter
b. Spectrometer
c. Refractometer
d. Photometer
15. The energy of activation using catalyst for a reaction is:
a. Not changed
b. Increased
c. Moderate
d. Decreased
16. With increase of 10oC temperature, the rate of reaction becomes double. The increase in rate of reaction is due to:
a. Increase in activation energy of reactants
b. Decreases in the activation energy of reaction
c. Increase in number of effective collisions
d. Decreases in number of collision between the nolecules
17. The minimum amount of energy required for an effective collision is mcalled:
a. Transitional energy
b. Activation energy
c. Internal energy
d. None of these
18. The equation K=Ae-Ea/Rt is called:
a. Rate equation
b. General gas equation
c. Rate law
d. Arrthenius equation
19. The catalyst used for the reaction, HCOOH → H2 + CO2 is:
a. Silica
b. Copper
c. Iron
d. Alumina
20. A substance which makes the catalyst effective is called:
a. Promoter
b. Inhibitor
c. Auto-Catalyst
d. Retarder