The statement that is not correct is

Options

A. hypophosphorous acid reduces silver nitrate to silver
B. in solid state `PCl_5` exits as `[PCl_(4)]^(+)[PCl_(6)]^(-)`
C. pure phosphine is non-inflmmable
D. phosphorous acid on heating disproportionates to give metaphosphoric acid and phosphine

Answer

C

Explanation

Pure phosphine gas is stable in air and non inflammable at normal temperature but on heating upto `150^(@)C` , it catches fire and produces phosphorus pentaoxide. `2PH_3+4O_2 overset(150^(@)C)to P_2O_5+3H_2O`.