`P_4` undergoes disproportionation in basic medium to give `PH_3` (phosphine) and `H_2PO^(ɵ)` (dihydrogen hypophoshite ion). Atomic weight of P is 31.

Br_2 undergoes disproportionation reaction in basic medium to give Br^(ɵ) ion and BrO_3^(ɵ) (bromate) ion in reduction and oxidation reaction.

Br_2 undergoes disproportionation reaction in basic medium to give Br^(ɵ) ion and BrO_3^(ɵ) (bromate) ion in reduction and oxidation reaction.

18 " mL of " 1.0 M Br_(2) solution undergoes complete disproportionation in basic medium to Br^(The hardness of water in terms of ) and BrO_(3)^(ɵ) . Then the resulting solution required 45 " mL of " As^(3+) solution to reduce BrO_(3)^(ɵ) to Br^(ɵ) . As^(3+) is oxidised to As^(5+) which statements are correct?

18 " mL of " 1.0 M Br_(2) solution undergoes complete disproportionation in basic medium to Br^(The hardness of water in terms of ) and BrO_(3)^(ɵ) . Then the resulting solution required 45 " mL of " As^(3+) solution to reduce BrO_(3)^(ɵ) to Br^(ɵ) . As^(3+) is oxidised to As^(5+) which statements are correct?

Give reasons: H_(3)PO_(3) undergoes disproportionation reaction, but H_(3)PO_(4) does not.

Equivalent weight of H_3PO_2 when it disproportionate into PH_3 and H_3PO_3 is :