Question:
The compound that is used in smoke screens is:
The compound that is used in smoke screens is:
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Calcium phosphide releases phosphine gas which ignites in air, forming white smoke – ideal for smoke screens.
Updated On: May 17, 2025
- \( \text{Mg}_3\text{N}_2 \)
- \( \text{MgO} \)
- \( \text{NaN}_3 \)
- \( \text{Ca}_3\text{P}_2 \)
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The Correct Option is D
Solution and Explanation
- Calcium phosphide \( (\text{Ca}_3\text{P}_2) \) reacts with moisture to produce phosphine gas \( \text{PH}_3 \), which ignites spontaneously in air, producing thick white smoke.
\[ \text{Ca}_3\text{P}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Ca(OH)}_2 + 2\text{PH}_3 \] - This property makes it useful in military smoke screens.
\[ \text{Ca}_3\text{P}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Ca(OH)}_2 + 2\text{PH}_3 \] - This property makes it useful in military smoke screens.
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