Which of the following statement is incorrect for phosphine…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Physical and Chemical Properties of Group 15th Elements Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Which of the following statement is incorrect for phosphine ?

It is not very soluble in water and aqueous solutions are neutral.

The solution of PH 3 in water is stable even in presence of sun light.

It does react with gaseous HI to form PH 4 I.

The spontaneous combustion of phosphine is technically used in Holme’s signals.

Text Solution

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The correct answer is:

It is slightly soluble in water ; the aqueous solution being neutral.

The solution of PH 3 in water decomposes in presence of light giving red phosphorus and H 2 .

Phosphonium compounds are obtained when anhydrous phosphine reacts with anhydrous halogen acids (not in aqueous solution).

Containers containing calcium carbide and calcium phosphide are pierced and thrown in the sea when the gases evolved burn and serve as a signal.

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