MCQ
Name the hydrocarbon that is a liquid at $STP$
- AEthane
- BPropane
- C$n-$ butane
- ✓$n-$ pentane
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[Atomic mass $: \mathrm{Na}=23.0, \mathrm{O}=16.0, \mathrm{H}=1.0]$
$4H_{(g)} \rightarrow 2H_{2(g)}$ is $-869.6\ kJ$
The dissociation energy of $H - H$ bond is ............ $\mathrm{kJ}$