Which of the following statements is $CORRECT$?
- A$Li$ is harder than the other alkali metals.
- BIn the $Solvay$ process,$NH_3$ is recovered when the solution containing $NH_4Cl$ is treated with $Ca(OH)_2$.
- C$Na_2CO_3$ is known as pearl ash.
- DBeryllium and aluminium ions do not have a strong tendency to form complexes like $[BeF_4]^{2-}$ and $[AlF_6]^{3-}$.
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|---|---|
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$2Na_2O \overset{400 \ ^oC}{\rightleftharpoons} A + 2Na$
$A + SO_2 \to Na_2SO_4$
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In the above reaction,$A$ is:
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In the above reaction,$A$ is:
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