JEE MAIN - Chemistry (2021 - 25th July Evening Shift - No. 20)
For a chemical reaction A $$\to$$ B, it was found that concentration of B is increased by 0.2 mol L$$-$$ in 30 min. The average rate of the reaction is ____________ $$\times$$ 10$$-$$1 mol L$$-$$1 h$$-$$1. (in nearest integer)
Answer
4
Explanation
A $$\to$$ B
$$\matrix{ {t = 0} & 0 \cr {t = 30\,\min } & {0.2M} \cr } $$
Av. rate of reaction = $$ - {{\Delta [A]} \over {\Delta t}} = {{\Delta [B]} \over {\Delta t}} = {{(0.2 - 0)} \over {{1 \over 2}}}$$
$$ = 0.4 = 4 \times {10^{ - 1}}$$ mol / L $$\times$$ hr
$$\matrix{ {t = 0} & 0 \cr {t = 30\,\min } & {0.2M} \cr } $$
Av. rate of reaction = $$ - {{\Delta [A]} \over {\Delta t}} = {{\Delta [B]} \over {\Delta t}} = {{(0.2 - 0)} \over {{1 \over 2}}}$$
$$ = 0.4 = 4 \times {10^{ - 1}}$$ mol / L $$\times$$ hr
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