1.

P_(4)overset(Ba(OH)_(2))underset(Delta)(to)underset("salt")(X) + underset("gas")(Y) uarr Xoverset("dil." H_2SO_4)rarrZdarr+underset("acid")WWhich is incorrect about Y?

Answer»

It usually IGNITES due to PRESENCE of `P_2H_4`
It is LESS soluble than `NH_3` in water
It has `107^(@) 28^(1)` bond angles
It can be obtained by HYDROLYSIS of `Ca_(3)P_2`

Solution :`P_(4)+3Ba(OH)_2+6H_(2)Orarr3Baunderset(X)((H_2PO)_2)+underset(Y)(2PH_3uarr)Baunderset(X)(H_2PO_2)+underset("dil")(H_2SO_(4))rarrunderset(Z)(BaSO_4darr)+underset(W)(H_3PO_2)`
Y is `PH_3` - less soluble than `NH_3` in water as it is weak base
`-Ca_(3)P_(2)+6H_(2)Orarr3Ca(OH)_2+2PH_(3)`
`-PH_3` contains impurity diphosphine `(P_2H_4)` - which catches fire readily and ignites `PH_3`


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