Be and Al are a diagonal pair. Select the correct statement(s).

ABoth metals dissolve in aqueous NaOH to give hydrogen and a hydroxo complex.
B $BeCl X_{2}$ and $AlCl X_{3}$ both act as Lewis acids.
CBoth hydroxides are strongly basic.
DThe carbides $Be X_{2} C$ and $Al X_{4} C X_{3}$ both give methane on hydrolysis.

Answer: A, B, D

Be and Al both give hydrogen with NaOH, forming

[Be (OH) X_{4}] X^{2 -}

and

[Al (OH) X_{4}] X^{-}

. Both chlorides have incomplete octets and accept electron pairs. The carbides are both methanides. The hydroxides are amphoteric, not strongly basic, so C is false.

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