Question

The initial rates of reaction
3A + 2B + C → Products, at different initial concentrations
are given below:
Initial rate, [A]0, M [B]0, M [C]0, M
Ms–1
5.0 × 10⁻³ 0.010 0.005 0.010
5.0 × 10⁻³ 0.010 0.005 0.015
1.0 × 10⁻² 0.010 0.010 0.010
1.25 × 10⁻³ 0.005 0.005 0.010
The order with respect to the reactants, A, B and C are
respectively
(a) 3, 2, 0 (b) 3, 2, 1
(c) 2, 2, 0 (d) 2, 2, 1

Answer 1

Answer:

b is the answer

Explanation:

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Answer 2

The order with respect to the reactants, A, B and C are respectively are :

Reaction : 3A + 2B + C → Products

1. Comparing 1st and 2nd observation, we can see that on changing concentration of C, there is no change in rate of reaction.

• Therefore, we can conclude that rate does not depends on concentration of C

2. Again comparing 2nd and 3rd observation, we can see that rate gets doubled when concentration of B gets twice.

• That means rate is directly proportional to second power of concentration of B.

3. From 4th observation, we can conclude that rate gets 1/0.25 times when concentration of A and B gets reduced by half.

• Hence, rate is also directly proportional to second power of concentration of A.

• Correct option : (c)