Which one of the following statement is not correct regarding phosphine ?

Options

A. It is a weak base
B. It reacts with `CuSO_(4)` solution to from `CuHPO_(4)`
C. It is formed by the reaction of `Ca,P_(2) ` with `HCI`
D. `It is used in smoke screens

Answer

B

Explanation

Phosphine gives a black precipitate of cupric phoshide when passed through `CuSO_(4)` solution
`3CuSO_(4) + 2PH_(3) to Cu_(3) P_(2) + 3H_(2) SO_(4)`
`PH_(3) `is a weak base. It is prepared by as follows :
`Ca_(3) P_(2) + 6HCI to 2PH_(3) + 3CaC1_(2)`
`PH_(3)` is used in smoke screens
Hence option (b) is incorrect . while other options are correct.