In which of the following reactions, $\mathrm{H}_2$ is liberated? i. $\mathrm{Al}(\mathrm{s})+\mathrm{H}…
In which of the following reactions, $\mathrm{H}_2$ is liberated?
i. $\mathrm{Al}(\mathrm{s})+\mathrm{H} \mathrm{Cl}(\mathrm{aq}) \rightarrow$
ii. $\mathrm{A} /(\mathrm{s})+\mathrm{NaOH}(\mathrm{aq}) \rightarrow$
iii. $\mathrm{B}_2 \mathrm{H}_6(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(l) \rightarrow$
iv. $\mathrm{F}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(l) \rightarrow$