Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 3

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Exercise:-2

Q: 1. From the rate expression for the following reactions, determine their order of reaction and the dimensions of the rate constants.

(i)

(ii)

(iii)

(iv)

Answer:

(i) Given rate

Therefore, order of the reaction

Dimension of

(ii) Given rate

Therefore, order of the reaction

Dimension of

(iii) Given

Therefore, order of the reaction

Dimension of

(iv) Given rate

Therefore, order of the reaction

Dimension of

Q: 2. For the reaction:

The with. Calculate the initial rate of the reaction when .

Answer:

The initial rate of the reactionis

When is reduced from, the concentration of A reacted

Therefore, concentration of B reacted

Then, concentration of B available,

After is reduced to, the rate of the reaction is given by,

Q: 3. The decomposition of NH3on platinum surface is zero order reaction. What are the rates of production of?

Answer:

The decomposition of on platinum surface is represented by the following equation.

Therefore,

However, it is given that the reaction is of zero order

Therefore,

Therefore, the rate of production of is

And, the rate of production of is

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