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STANDARD Chemistry Rate of Reaction MCQ Question

Type: MCQ-numerical-Medium-Class 12

In a reaction, 2HI → H₂ + I₂, the concentration of HI decreases from 0.5 mol L⁻¹ to 0.4 mol L⁻¹ in 10 minutes. What is the rate of reaction during this interval?

A

5 × 10⁻³ M min⁻¹

B

2.5 × 10⁻³ M min⁻¹

C

5 × 10⁻² M min⁻¹

D

2.5 × 10⁻² M min⁻¹

Correct Answer

Option A

Detailed Explanation

The rate of reaction is calculated as 0.5−0.410=0.01 M min−1\frac{0.5 - 0.4}{10} = 0.01 \text{ M min}^{-1}. Since the stoichiometry is 2:1, the rate is 0.012=5×10−3 M min−1\frac{0.01}{2} = 5 \times 10^{-3} \text{ M min}^{-1}.

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