Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Single Correct MCQ
Published on: August 12, 2026

Which of the following is/are incorrect statement(s) for phosphine ?

A
It is less basic then NH 3
B
It is less poisonous than NH 3
C
The solution of copper sulphate gives no precipitate with PH 3 .
D
Phosphine burns in air forming predominantly H 3 PO 4 .

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(b,c,d)

In PH 3 the lone pair of electrons is present in spherical non directional more concentrated s-orbital where as lone pair of electrons is present in directional 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 .

It is incorrect statement.

3CuSO 4 + 2PH 3 ⎯→ Cu 3 P 2 (black ppt) + H 2 SO 4

PH 3 + O 2 ⎯→ Dense white fumes of P 4 O 10 . H 3 PO 4 is negligibly formed.

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