Alkali metals have negative reduction potential and hence they behave as

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: The alkali metals and their salts impart characteristic colour to reducing flame.
Reason $R$: Alkali metals can be detected using flame tests.
In the light of the above statements,choose the most appropriate answer from the options given below.

The catalyst used to convert sodium to sodium amide is

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

What is the product formed when $Zn$ reacts with an excess of $NaOH$?

Match the following:

Compound	Uses
$1$. $CaCO_3$	$a$. In preparation of oils and fats
$2$. $NaOH$	$b$. As an antiseptic
$3$. $Ca(OH)_2$	$c$. As an antacid
$4$. $NaHCO_3$	$d$. For making bleaching powder