Assertion (A): dissolves in excess of NaOH.

Reason(R):is an amphoteric compound.

Read the above assertion and reason and choose the correct statement regarding it.

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Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Assertion is true but Reason is false.

Both Assertion and Reason are false.

answer is B.

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Detailed Solution

Concept- An amphoteric substance shows the properties both acids and bases.
Some metal hydroxides are amphoteric compounds. These hydroxides do not dissolve in water. But adding excess NaOH (aq) to these precipitates dissolves them in water.
One such hydroxide is Beryllium hydroxide,

Be (O {H)}_{2}

.
When

dissolved in NaOH, it forms sodium beryllate which is highly soluble in water.

.
It is also correct that

is an amphoteric compound, it can react with both acid and base.
Although both assertion and reason are true, reason is not the correct explanation of assertion.
Hence, the correct answer is 2.

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