Which one of the following elements reduces $\mathrm{NaOH}$ to $\mathrm{Na}$ ?
Which one of the following elements reduces $\mathrm{NaOH}$ to $\mathrm{Na}$ ?
$\mathrm{Si}$
$\mathrm{Pb}$
$\mathrm{C}$
$\mathrm{Sn}$
Solution
$\mathrm{NaOH}$ when heated with coke, gets reduced to Na.
$6 \mathrm{NaOH}+2 \mathrm{C} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Na}+2 \mathrm{Na}_2 \mathrm{CO}_3+3 \mathrm{H}_2 \uparrow$
Here, C behaves as reducing agent.