Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide. Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide: (a) Both A and Rare true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) Both A and R are not correct. (d)A is not correct but R is correct.

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