Assertion : For drying $H_{2}S$, Conc. $H_{2}S{O}_4$ cannot be used.

Reason: Moist $H_{2}S$ is oxidized by Conc.$H_{2}S{O}_4$

Q. Assertion: The compressibility factor for $H_2$​ and $He$ is $(1+\frac{Pb}{RT})$
Reason: The compressibility factor for $H_2$​ and $He$ can be derived from Van der Waal's equation.

Q. Assertion : Bond order of $H_2^{+}\text{is}\mathrm{0.5.}$
Reason : Electrons are removed from the antibonding molecular orbital from $H_2.$

Q. Assertion : In the bonding molecular orbital (MO) of $H_2$, the electron density is increased between the nuclei.
Reason : The bonding MO is ${\psi }_A+{\psi }_B$, which shows destructive interference of the combining electron waves.

Q.

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $HN{O}_{3}and{H}_{2}S{O}_4$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q.

Assertion – The non-fusible impurities present in iron ore are removed by $CaC{O}_3$ .

Reason: $CaC{O}_3$ which decomposes into $CaO$ and $C{O}_2$. The $CaO$ formed reacts with $Si{O}_2$ to remove silica