Question

Which of the following is an example of second order reaction ?

• A. \(2\,\text{H}_2\text{O}_{2(l)}\rightarrow 2\text{H}_2\text{O}_{(l)}+\text{O}_{2(g)}\)
• B. \(\text{CH}_3\text{CHO}_{(g)}\rightarrow \text{CH}_{4(g)}+\text{CO}_{(g)}\)
• C. \(2\,\text{NO}_{2(g)}+\text{F}_{2(g)}\rightarrow 2\text{NO}_2\text{F}_{(g)}\)
• D. \(2\,\text{NO}_{(g)}+2\text{H}_{2(g)}\rightarrow \text{N}_{2(g)}+2\text{H}_2\text{O}_{(l)}\)

Hint:

Second order means the rate depends on the sum of powers of concentration equal to 2.

Answer 1

The Correct Option is C

Step 1: Remember the rate laws:
Fluorination of nitrogen dioxide is first order in each reactant. The total order is the sum of exponents.

Step 2: Add the exponents:
(C): 1 + 1 = 2. For the others the sums are 1, 1.5 and 3. So only (C) is second order.

Final Answer:
Option (C). \[ \boxed{\text{(C)}} \]