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Class 12

Chemistry

Chemical Kinetics

Solution for Class 12, Chemistry, Chemical Kinetics

Question 1

The order of reaction is decided by

temperature
mechanism of reaction as well as relative concentration of reactants
molecularity
pressure.

Topic:

Chemical Kinetics

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Question 2

Which of the following statements for order of reaction is not correct?

Order can be determined experimentally.
Order of reaction is equal to the sum of powers of concentration terms in rate law expression.
Order cannot be fractional.
Order is not affected by stoichiometric coefficient of the reactants.

Topic:

Chemical Kinetics

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Question 3

What will be the rate equation for the reaction

2 X + Y \to Z

, if the order of the reaction is zero?

Rate $= k [X] [Y]$
Rate $= k$
Rate $= k [X]^{0} [Y]$
Rate $= k [X] [Y]^{0}$

Topic:

Chemical Kinetics

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Question 4

For a reaction,

I^{-} + OCl^{-} \to IO^{-} + Cl^{-}

in an aqueous medium, the rate of reaction is given by

\frac{d [ IO ^{-} ]}{d t} = k \frac{[ I ^{-} ] [ OCl ^{-} ]}{[ OH ^{-} ]}

. The overall order of reaction is

$- 1$
0
1
2

Topic:

Chemical Kinetics

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Question 5

(6.8)

PLPIMHT-CET 7. The term

(- dC / d t)

in rate equation refers to

the concentration of a reactant
the decrease in concentration of the reactant with time
the velocity constant of reaction
none

Topic:

Chemical Kinetics

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Question 6

(日)

N_{2} + 3 H_{2} \to 2 NH_{3}

Eafe of appearence of NHy is

2 \cdot 5 \times 1 0^{- 4} malel^{- 1} sec^{- 1}

Caccuiate the late of disappearence of

H_{2}

\& also Carcurate bate of feaction.

Topic:

Chemical Kinetics

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Question 7

D Haly life period is a reaction 2 howr Q.w muich in takes lime for 29.9\% completion.

Topic:

Chemical Kinetics

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Question 8

0. What is meant by entropy? Predict the entropy change (positive or negative) in the following cases and give reason.

(i) Temperature of a crystal is increased.
(ii) $CaCO_{3}$ (s) $⟶ CaO$ (s) $+ O_{2}$ (g)
(iii) $N_{2} (g) (l atm) ⟶ N_{2} (g) (0.5 atm)$
. A $2 L$ vessel contains oxygen at a pressure of $0.5$ atm at $2 7^{\circ} C .1.4 g$ of $N_{2}$ gas is introduced in the vessel. Will the pressure of

Topic:

Chemical Kinetics

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Question 9

Chemical behaviour of excess of hypo solution towards

Ag^{+} (aq)

is same as with

$Hg^{2 +} (aq)$
$Cu^{2 +} (aq)$
$Pb^{2 +} (aq)$
$Bi^{3 +} (aq)$

Topic:

Chemical Kinetics

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Question 10

Table 4. 1: Average rates of hydrolysis of butyl ebloride

It can be seen (Table 4.1) that the average rate falls from $1.90 \times 1 0^{- 4} mol L^{- 1} s^{2}$ to $0.4 \times 1 0^{- 4} mol L^{- 1} s^{- 1}$ . However, average rate cannot be used to predict the rate of a reaction at a particular instant as it would be constant for the time interval for which it is calculated. So, to express the rate at a particular moment of time we determine the instantaneous rate. It is obtained when we consider the average rate at the smallest time interval say d $t$ ( lie. when $Δ t$ approaches zero). Hence, mathematically for an infinitesimally small dt instantaneous rate is given by
Fig $4.2$
Instantaneous rate of", $0.12$