Q46 / 180 · COMEDK 2013 · Chemistry
What is the volume of '$20$ volume $\mathrm{H}_{2} \mathrm{O}_{2}$' required to get $5000 \mathrm{~cm}^{3}$ of oxygen at STP?
- Correct answerA$250 \mathrm{~cm}^{3}$
- B$50 \mathrm{~cm}^{3}$
- C$100 \mathrm{~cm}^{3}$
- D$125 \mathrm{~cm}^{3}$
Solution
20 volume of $\mathrm{H}_{2} \mathrm{O}_{2}$ means that, $1 \mathrm{~L}$ of $\mathrm{H}_{2} \mathrm{O}_{2}$ on decomposition gives 20 L of oxygen.
$\therefore 5 \mathrm{~L}$ of oxygen will be obtained from
$$
\begin{aligned}
&=\frac{5}{20} \times 1=0.250 \mathrm{~L}_{2} \text { of } \mathrm{H}_{2} \mathrm{O}_{2} \\
&=250 \mathrm{~cm}^{3} \text { of } 20 \text { volume } \mathrm{H}_{2} \mathrm{O}_{2}
\end{aligned}
$$
Hence, the correct answer is option: 'A'.