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Which of the following facts regarding Be and Al is not correct?

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Be and Al have the same electronegativity

Be and Al react with alkali to form beryllate, $Be (OH)_{4}^{2 -}$ , and aluminate $Al (OH)_{6}^{3 -}$ , respectively

Beryllium and aluminium nitrides liberate ammonia when treated with water

Beryllium and aluminium carbides liberate acetylene when treated with water

answer is D.

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Detailed Solution

Both beryllium and aluminium carbides form methane on hydrolysis:

$\begin{aligned} {Be}_{2} C + 4 H_{2} O \to 2 Be (OH)_{2} + {CH}_{4} \\ {Al}_{4} C_{3} + 12 H_{2} O \to 4 Al (OH)_{3} + 3 {CH}_{4} \end{aligned}$

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