Why does `PCl_(3)` or `PCl_(5)` fumes in air ?

Answer

A-p,r,s ; B-p,r,s,t ; C-r,s ; D-q,s

Explanation

`(A)overset(+4)(3XeF_4)(s)+6H_2O(l)tooverset(+6)(XeO_3)(s)+overset(0)(2Xe(g))+3/2O_2(g)+2HF(aq)`

(B)`overset(0)(P_4)+3OH^(-)(aq)+3H_2O(aq)+3H_2O(l)tooverset(-3)(PH_3)(g)+overset(+1)(3H_2PO_2^(-))(aq)`

The spontaneous combustion of phosphine evolved dense white fumes which surve as singals.
(C )`B_2H_6(g)+6H_2O(l)to2H_3BO_3(aq)+6H_2(g)`
`B(OH)_3+2H_2OhArr [B(OH)_4]^(-)+H_3O^(-)`(monobasic Lewis acid )

(D)`overset0(3Br_2)(g)+3Na_2CO_3(aq)tooverset(-1)(5NaBr)(aq)+overset(+5)(NaBrO_3)(aq)+3CO_2(g)`