#### Chemical Kinetics One Mark Questions

12th Standard EM

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Chemistry

Time : 00:30:00 Hrs
Total Marks : 10
6 x 1 = 6
1. For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

(a)

001. e−x

(b)

1 x 10-2(1-e-60x)

(c)

(1x10-2)e-60x

(d)

none of these

2. A zero order reaction X ⟶ XProduct, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is

(a)

10 s

(b)

5 min

(c)

20 min

(d)

cannot be predicted using the given information

3. The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

(a)

Enthalpy

(b)

Activation energy

(c)

Entropy

(d)

Internal energy

4. For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10-4 mol L-1s-1. Identify the rate of reaction.

(a)

4 x10-5mol L-1s-1

(b)

4.5 x 10-1mol L-1s-1

(c)

3.6 x 10-4 mol L-1s-1

(d)

None of these

5. For the reaction, 2N2O5 ⟶4 NO2+O2, select the correct statement.

(a)

Rate of formation of O2 is same as rate of formation of NO2

(b)

Rate of disappearance of N2O5 is two times the rate of formation of NO2.

(c)

Rate of formation of O2 is 0.5 times rate of disappearance of N2O5

(d)

Rate of formation of NO2 is equal to rate of disappearance of N2O5

6. In pseudo-order reactions

(a)

The actual order of reaction is different from that expected using rate law expression

(b)

The concentration of at least one reactant is taken in large excess.

(c)

The concentration of reactant taken in excess may be taken as constant

(d)

All of these

7. 4 x 1 = 4
8. n = 2

9. (1)

II Order

10. Arrhenius

11. (2)

1

12. N2O5(g) ⟶2NO2(g) + $\frac { 1 }{ 2 }$ O2(g)

13. (3)

0

14. CH3COCH3 + I2 $\overset { H }{ \longrightarrow }$ ICH2 COCH3 + HI

15. (4)

$k={ Ae }^{ -\left( \frac { Ea }{ RT } \right) }$