Question

Which of the following is//are incorrect statement(s) for phosphine ?
A. It is less basic then `NH_(3)`.
B. It is less poisonous then `NH_(3)`.
C. The solution of `PH_(3)` in water does not decompose.
D. Phosphine on heating at `150^(circ)C` "burns forming" `H_(3)PO_(4)`.

Answer 1

Correct Answer - B,C
(A) In `PH_(3)` the lone pair of electrons is present in sepherical non directional more concentrated s-orbital where as lone pair of electrons is present in dirctional `sp^(3)` hybrid orbital. As a result, the ease of donation of lone pair of electron is more in `NH_(3)` as compare to `PH_(3)`.
(B) It is incorrect statement.
(C ) The solution of `PH_(3)` in water decomposes in presence of light giving red phosphorus and `H_(2)`.
(D) `PH_(3)+2O_(2)to H_(3)PO_(4)` is correct statement `(PH_(3) lt NH_(3)) NH_(3)` is more basic thaen `PH_(3)`.