Question

For a reaction \(\mathrm{A} \rightarrow\) Product, rate constant is \(6.93 \times 10^{-3}\) hour \({ }^{-1}\). What is order of reaction?

• A. Zero
• B. 1
• C. 1.5
• D. 2

Hint:

The unit of the rate constant depends on the order of reaction.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
For order \(n\), the unit of \(k\) is \((\text{mol L}^{-1})^{1-n}\,\text{time}^{-1}\).

Step 2: Substitution
The given unit is only \(\text{hour}^{-1}\), with no concentration term.

Step 3: Conclusion
So \(1 - n = 0\), which means \(n = 1\). The reaction is of first order.

Final Answer:
The reaction is of first order. \[ \boxed{\text{(B) }1} \]