Which one of the following is an $s$-block element?

Which of the following metals produces hydrogen gas when heated with hot concentrated alkali?

Consider the following reactions:
$Cs + O_2 \text{ (excess)} \rightarrow X$
$Na + O_2 \rightarrow Y$
Identify the correct statement about $X$ and $Y$.

Which among the following sets of compounds is used as raw material for the preparation of sodium carbonate by the Solvay process?

$A$ mixture of lime paste is composed of sand,water,and which of the following?

$Cs^{+}$ ions impart violet colour to Bunsen flame. This is due to the fact that the emitted radiations are of