Identify correct statement for reaction stated below.

$$ \mathrm{Ag}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O}+2 \mathrm{e}^{-} \longrightarrow 2 \mathrm{Ag}+2 \mathrm{OH}^{-} $$

Which of the following inert gases is used for magnetic resonance imaging?

A weak base is $5 \%$ dissociated in its 0.01 M solution. Calculate the dissociation constant.

Which of the following compounds forms 1-bromo-1-methylcyclohexane when treated with HBr ?