Assertion :$N{H}_3$ gas is dried by $CaO$ and not by $P_2{O}_5$ and $H_{2}S{O}_4$. Reason: Moist $N{H}_3$ can react with $P_2{O}_5$ forming phosphate and sulphate with conc. $H_{2}S{O}_4$.

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

Q. Assertion: The impurities such as ${\text{SiO}}_2$ present in iron ore is removed by ${\text{CaCO}}_3$.

Reason: $\text{CaO}$ formed by decomposition of ${\text{CaCO}}_3$ reacts with ${\text{SiO}}_2$ to form slag.

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

Lithium sulphate does not form alums.

Reason

$L{i}^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

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.