The element absent in RNA is

Nitrogen

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Sulphur

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Oxygen

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Hydrogen

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Solution

The correct option is B Sulphur
RNA contains nitrogenous bases. RNA majorly contains Carbon, it also has Phosphorus, Nitrogen and several bonds with oxygen as well as hydrogen. It however does not contain Sulphur. It is present in some proteins.
So, the correct answer is 'Sulphur'.

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