Assertion :Hn mRNA is larger than mRNA. Reason: HnRNA has nontranslating introns and more exons than required for translation.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
HnRNA ( heterogeneous nuclear RNA ) has both coding sequences exons and noncoding sequences introns and is non-functional so it has to undergo splicing the process in which introns are removed and exons are joined together to form mRNA ( messenger RNA) which is functional. hnRNA is longer than mRNA as it has both introns and exons while in mRNA only exons are joined together. So, the assertion is correct but the reason is incorrect.
So, the correct option is C.

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Lithium sulphate does not form alums.

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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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