MCQ
Oxygen gas can be prepared from solid $KMn{O_4}$ by
- ✓Strongly heating the solid
- BTreating the solid with ${H_2}$ gas
- CDissolving the solid in dil. ${H_2}S{O_4}$
- DDissolving the solid in dil. $HCl$
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| Experiment |
$[A]$ (in $mol\, L^{-1})$ |
$[B]$ (in $mol\, L^{-1})$ |
Initial rate of reaction (in $mol\, L^{-1}\,min^{-1})$ |
| $I$ | $0.10$ | $0.20$ | $6.93 \times {10^{ - 3}}$ |
| $II$ | $0.10$ | $0.25$ | $6.93 \times {10^{ - 3}}$ |
| $III$ | $0.20$ | $0.30$ | $1.386 \times {10^{ - 2}}$ |
The time(in minutes) required to consume half of $A$ is
[Given : Molal depression constant of water = $1.85 \,K \,kg \,mol ^{-1}$ Freezing point of pure water $\left.=0^{\circ} C \right]$