MCQ
$20\,mL$ of $CO_2$ gas are passed over excess of red hot coke. the volume of $CO$ evolved is ............. $\mathrm{mL}$
$CO_{2(g)} + C_{(s)} \to 2CO_{(g)}$
- A$10$
- B$20$
- C$30$
- ✓$40$
✓
Answer
Correct option: D.
$40$
d
$20 \mathrm{mL}$ of $\mathrm{CO}_{2}$ gas is passed over red hot coke. The volume of carbon monoxide evolved is $40$ $mL$.
$20 \mathrm{mL}$ of $\mathrm{CO}_{2}$ gas is passed over red hot coke. The volume of carbon monoxide evolved is $40$ $mL$.
$\mathrm{CO}_{2}(g)+C(s) \rightarrow 2 \mathrm{CO}(g)$
$1$ mole of $\mathrm{CO}_{2}$ gas will form $2$ moles of $\mathrm{CO}$ gas.
since volume is proportional to number of moles,
$20 \mathrm{mL}$ of $\mathrm{CO}_{2}$ gas will form $2 \times 20=40 \mathrm{mL}$ of $\mathrm{CO}$ gas.
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