STANDARDChemistry-Chemical Kinetics
STANDARD Chemistry Rate of Reaction MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Nitrogen dioxide (NO₂) dissociated into nitric oxide (NO) and oxygen (O₂) as follows: 2NO₂ → 2NO + O₂. If the rate of decrease of concentration of NO₂ is 6.0 × 10⁻¹² mol L⁻¹ s⁻¹, what will be the rate of increase of concentration of O₂?
A
3.0 × 10⁻¹² mol L⁻¹ s⁻¹
B
6.0 × 10⁻¹² mol L⁻¹ s⁻¹
C
1.0 × 10⁻¹² mol L⁻¹ s⁻¹
D
1.5 × 10⁻¹² mol L⁻¹ s⁻¹
Correct Answer
Option A
Detailed Explanation
The stoichiometry of the reaction shows that for every 2 moles of NO₂ decomposed, 1 mole of O₂ is formed. Therefore, the rate of formation of O₂ is half the rate of decomposition of NO₂, which is 3.0 × 10⁻¹² mol L⁻¹ s⁻¹.
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