Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ 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.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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Assertion :HNO3 oxidises sulphur to H2SO4 acid (S+VI) but only oxidises selenium to H2SeO3 (Se+IV). Reason: In selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.

Assertion : $H N O_{3}$ oxidises sulphur to $H_{2} S O_{4}$ acid (S+VI) but only oxidises selenium to $H_{2} S e O_{3}$ (Se+IV). Reason: In selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.