Chemical Kinetics Test

Result

Chemical Kinetics Test - 74

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Question 1
1 / -0

For a particular gaseous reaction a graph was plotted as shown. It shows that the reaction of $$A$$ is

A
Zero order w.r.t $$A$$

B
1st order w.r.t $$A$$

C
Second order w.r.t $$A$$

D
a non-integer order w.r.t $$A$$

Solution
Question 2
1 / -0

For a first order reaction, $${\text{A}} \to {\text{P,}}{{\text{t}}_{{\text{1/2}}}}\left( {{\text{half -}}\,{\text{life}}} \right)$$ is $$10$$ days. The time required for $$\dfrac{1}{4}^{th}$$ conversion of $$A$$(in days) is : $$\left( {{\text{ln}}\,{\text{2 = 0}}{\text{.693, ln}}\,{\text{3 = 1}}{\text{.1}}} \right)$$

A
$$4.1$$

B
$$5$$

C
$$2.5$$

D
$$3.2$$

Solution
Question 3
1 / -0

Out of $$300$$g substance [decomposes as per $$1^{st}$$ order], how much will remain after $$18$$ hr?
$$(t_{0.5}=3\, hr)$$

A
$$4.6$$ gm

B
$$5.6$$ gm

C
$$9.2$$ gm

D
$$6.4$$ gm

Solution
Question 4
1 / -0

Activation energy of the backward reaction is 10 kcal and $$\Delta H=$$ 2.813 kcal.

Activation energy of the forward reaction is ___________ kcal.

A
$$128.13$$

B
$$12.813$$

C
$$12813$$

D
none of these

Solution
Question 5
1 / -0

According to the Arrhenius equation,

A
a high activation energy usually implies a fast reaction

B
rate constant increases with increase in temperature. This is due to a greater number of collisions whose energy exceeds the activation energy

C
higher the magnitude of activation energy, stronger is the temperature dependence of the rate constant.

D
the pre-exponential factor is a measure of the rate at which collisions occure, irrespective of their energy.

Solution
Question 6
1 / -0

For a gaseous equilibrium : $$2A(g)\rightleftharpoons 2B(g)+C(g)$$ $$K_{p}$$ has a value 1.8 at 700 K. The value of $$K_{c}$$ for the equilibrium : $$2B(g+C(g)\rightleftharpoons 2A(g)$$ at that temperature is about _________.

A
0.031

B
32

C
57.4

D
103.3

Solution
Question 7
1 / -0

In the following first order competing reaction:
A+Reagent $$\longrightarrow$$ Product B+Reagent $$\longrightarrow$$ Product
The ratio of $${ K }_{ 1 }/{ K }_{ 2 }$$ if only 50% of B will have been reacted when 94% of A has been reacted is:

A
4.06

B
0.246

C
2.06

D
0.06
Question 8
1 / -0

Decomposition of HI (g) on Gold surface is zero order reaction.Initially few moles of $$H_2$$ are present in container then which of the following graph is correct?

A

B

C

D

Solution
Question 9
1 / -0

$$A\rightarrow B$$ first order reaction $$A$$ is optical active and $$B$$ is optically inactive, a series of experiment were conducted on a solution of $$A$$
Time 0 60 min $$\infty$$
optical rotation $${82}^{o}$$ $${77}^{o}$$ $${2}^{o}$$
Assume some impurity present calculate the optical rotation after $$5$$ hours
(Given in $$1.066=0.064,{e}^{0.16}=1.17$$)

A
60

B
30

C
20

D
120

Solution
Question 10
1 / -0

For an exothermic reaction $$Ea, Ea^{'} $$ are the activation energies of the forward and backward reactions respectively. Then which is always false:

A
$$E_{a} < {E_a}^{'}$$

B
$$E_{a} > \triangle H$$

C
$$E_{a} < \triangle H$$

D
$${E_a}^{'} < \triangle H$$