MCQ
$A$ is :


- A

- ✓

- C

- D







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(Given that $K_f = 5\,K\, kg\,mol^{-1},$ Molar mass of benzoic acid $= 122\,g\,mol^{-1}$ )

Set $1$: $Al_2O_3 .xH_2O\, (s)$ and $OH^-(aq)$
Set $2$: $Al_2O_3 .xH_2O\, (s)$ and $H_2O\,(l)$
Set $3$: $Al_2O_3 .xH_2O\, (s)$ and $H^+(aq)$
Set $4$: $Al_2O_3 .xH_2O\, (s)$ and $NH_3(aq)$