(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

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Assertion :NaOH cannot be stored in a vessel made of aluminium or zinc. Reason: A protective layer of oxide is formed on the surface of the metal.

The correct option is C Assertion is correct but Reason is incorrectNaOH cannot be stored in the vessel made of aluminum or zinc because it corrodes the metal and produces high inflammable hydrogen gas. Therefore the assertion is the correction but the reason for this assertion is incorrect.

Assertion : $N a O H$ cannot be stored in a vessel made of aluminium or zinc. Reason: A protective layer of oxide is formed on the surface of the metal.

The correct option is C Assertion is correct but Reason is incorrect
$N a O H$ cannot be stored in the vessel made of aluminum or zinc because it corrodes the metal and produces high inflammable hydrogen gas. Therefore the assertion is the correction but the reason for this assertion is incorrect.