MCQ
In terms of polar character, which of the following order is correct?
- A$NH_3 < H_2O < HP < H_2S$
- B$H_2S < NH_3 < H_2O < HF$
- C$H_2O < NH_3 < H_2S < HF$
- D$HF < H_2O < NH_3 < H_2S$
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$(i)\, H_3PO_4+H_2O \rightarrow H_3O^+ + H_2PO_4^-$
$(ii)\, H_2PO 4^- + H_2O \rightarrow HPO_4^{2-} + H_3O^+$
$(iii)\, H_2PO_4^-+ OH^- \rightarrow H_3PO_4 + O^{2-}$
In which of the above does $H_2PO_4^-$ act as an acid ?
$AB , A _2$ and $B _2$ are diatomic molecule. If the bond enthalpies of $A _2, B _2$ and $AB$ are in the ratio $1: 0.5: 1$, then the bond enthalpy of $A_2$ is $......\,kJ\,mol ^{-1}$ (Nearest integer)