Question:
Observe the following reaction
\[
\mathrm{PH_3(g)}
\xrightarrow{\text{Light}}
X+\mathrm{H_2}
\]
\[
\mathrm{PH_3(g)}
\xrightarrow{300^\circ\mathrm{C}}
X+\mathrm{H_2}
\]
Which of the following is NOT correct regarding \(X\)?
Observe the following reaction
\[
\mathrm{PH_3(g)}
\xrightarrow{\text{Light}}
X+\mathrm{H_2}
\]
\[
\mathrm{PH_3(g)}
\xrightarrow{300^\circ\mathrm{C}}
X+\mathrm{H_2}
\]
Which of the following is NOT correct regarding \(X\)?
Show Hint
White phosphorus:
- Glows in the dark (chemiluminescence).
- Poisonous.
- Soluble in carbon disulphide.
- Non-poisonous.
- Polymeric.
- Does not glow in the dark.
- Insoluble in carbon disulphide.
Updated On: Jul 9, 2026
- It is non-poisonous, odourless solid
- It is insoluble in water and carbon disulphide
- It has polymeric structure
- It exhibits chemiluminescence in dark \bigskip
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Identify \(X\).
On heating or exposure to light, phosphine decomposes as
\[
4\mathrm{PH_3}
\rightarrow
\mathrm{P_4}+6\mathrm{H_2}
\]
The phosphorus obtained is red phosphorus.
Step 2: Analyse the statements.
• Red phosphorus is a non-poisonous, odourless solid. \checkmark
• It is insoluble in water and carbon disulphide. \checkmark
• It possesses a polymeric structure. \checkmark
• Chemiluminescence is exhibited by white phosphorus, not red phosphorus. \(\times\)
Step 3: Final conclusion. The incorrect statement is \[ \boxed{\text{It exhibits chemiluminescence in dark}.} \] Hence, the correct option is \(\boxed{(D)}\).
Step 2: Analyse the statements.
• Red phosphorus is a non-poisonous, odourless solid. \checkmark
• It is insoluble in water and carbon disulphide. \checkmark
• It possesses a polymeric structure. \checkmark
• Chemiluminescence is exhibited by white phosphorus, not red phosphorus. \(\times\)
Step 3: Final conclusion. The incorrect statement is \[ \boxed{\text{It exhibits chemiluminescence in dark}.} \] Hence, the correct option is \(\boxed{(D)}\).
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