The correct option is A 15.52 For a first order reaction, k=2.303tlog aa x k=2.3035log 10080 =0.044637 But the half life period t_1/2= ...

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Standard XII

Chemistry

Heat of Reaction

Question

$20$ % decomposition of $H_{2} O_{2}$ in the presence of acid requires $5$ min. The time required for $50$ % decomposition in minutes is:

15.52

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1.552

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0.1552

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7.76

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Solution

The correct option is A $15.52$
For a first order reaction, $k = \frac{2.303}{t} l o g \frac{a}{a - x}$

$k = \frac{2.303}{5} l o g \frac{100}{80}$

$= 0.044637$

But the half life period $t_{1 / 2} = \frac{0.693}{k}$

$= \frac{0.693}{0.044637}$

$= 15.52 m i n .$

Option A is correct.

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20% decomposition of H2O2 in the presence of acid requires 5 min. The time required for 50% decomposition in minutes is:

The correct option is A 15.52For a first order reaction, k=2.303tlogaa−xk=2.3035log10080=0.044637But the half life period t1/2=0.693k=0.6930.044637=15.52min.Option A is correct.

$20$ % decomposition of $H_{2} O_{2}$ in the presence of acid requires $5$ min. The time required for $50$ % decomposition in minutes is:

The correct option is A $15.52$
For a first order reaction, $k = \frac{2.303}{t} l o g \frac{a}{a - x}$

$k = \frac{2.303}{5} l o g \frac{100}{80}$

$= 0.044637$

But the half life period $t_{1 / 2} = \frac{0.693}{k}$

$= \frac{0.693}{0.044637}$

$= 15.52 m i n .$

Option A is correct.