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JEE Main levelSingle correct optionDifficulty 2 of 3sb124

Assertion (A): $Be (OH) X_{2}$ dissolves both in dilute HCl and in aqueous NaOH. Reason (R): $Be (OH) X_{2}$ is amphoteric.

ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true

Answer: A

Be (OH) X_{2} + 2 HCl BeCl X_{2} + 2 H X_{2} O

and

Be (OH) X_{2} + 2 NaOH Na X_{2} [Be (OH) X_{4}]

. Reaction with both an acid and a base is exactly what amphoteric means, so A is true and R explains it.

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