Q14 / 150 · MHT CET 2021 (20 Sep Shift 2) · Chemistry
Instantaneous rate of a reaction is $-\frac{1}{2} \frac{\mathrm{d}[\mathrm{x}]}{\mathrm{dt}}=-\frac{\mathrm{d}[\mathrm{y}]}{\mathrm{dt}}=\frac{1}{2} \frac{\mathrm{d}[\mathrm{z}]}{\mathrm{dt}}$, identify the reaction.
- A$\mathrm{x}-2 \mathrm{y} \longrightarrow 2 \mathrm{z}$
- Correct answerB$2 \mathrm{x}+\mathrm{y} \longrightarrow 2 \mathrm{z}$
- C$2 \mathrm{z}+\mathrm{y} \longrightarrow 2 \mathrm{x}$
- D$2 \mathrm{x}-2 \mathrm{y} \longrightarrow \mathrm{z}$
Solution
$$
-\frac{1}{2} \frac{\mathrm{d}[\mathrm{x}]}{\mathrm{dt}}=-\frac{\mathrm{d}[\mathrm{y}]}{\mathrm{dt}}=\frac{1}{2} \frac{\mathrm{d}[\mathrm{z}]}{\mathrm{dt}}
$$
Correct reaction: $2 \mathrm{x}+\mathrm{y} \longrightarrow 2 \mathrm{z}$
(-) sign represents the rate of reactants.
Hence, the correct answer is option: 'B'.