When $Zn$ is treated with excess of $NaOH$,the product obtained is

The solution of sodium metal in liquid ammonia is strongly reducing due to the presence of which of the following in the solution?

$NaOH$ is prepared by the method:

Which of the following metals will give $H_2$ gas on reaction with $NaOH$?

$A$ $s$-block element $(M)$ reacts with oxygen to form an oxide of the formula $MO_{2}$. The oxide is pale yellow in colour and paramagnetic. The element $(M)$ is:

What are the by-products in the Solvay process for the production of $Na_2CO_3$?