When $MnO_2$ and $H_2SO_4$ are added to $NaCl$,a greenish-yellow gas is evolved. Which gas is it?

Match the interhalogen compounds of Column-$I$ with the geometry in Column-$II$ and assign the correct code.

Column $I$	Column $II$
$A$. $XX'$	$i$. $T$-shape
$B$. $XX'_3$	$ii$. Pentagonal bipyramidal
$C$. $XX'_5$	$iii$. Linear
$D$. $XX'_7$	$iv$. Square pyramidal
	$v$. Tetrahedral

An inorganic white crystalline compound $(A)$ has a rock salt structure. $(A)$ on reaction with conc. $H_2SO_4$ and $MnO_2$ evolves a pungent smelling,greenish-yellow gas $(B)$. Compound $(A)$ gives a white precipitate of $(C)$ with $AgNO_3$ solution. Compounds $(A)$,$(B)$,and $(C)$ will be respectively:

In halogens,with the increase of atomic number,which trend is observed?

In chromyl chloride test,the oxidation state of $Cr$ changes from

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ $ICl$ is more reactive than $I_{2}.$
Reason $(R):$ $I-Cl$ bond is weaker than $I-I$ bond.
In the light of the above statements,choose the most appropriate answer from the options given below: