Question:
The formula of phosphine gas is
The formula of phosphine gas is
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Remember the basic composition of common gases like phosphine, which can be crucial in identifying their correct chemical formulas.
Updated On: May 31, 2026
- $\text{PH}_3$
- $\text{P}_2\text{H}_4$
- $\text{H}_3\text{PO}_3$
- $\text{H}_3\text{PO}_4$
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Phosphine gas is a chemical compound composed of phosphorus (P) and hydrogen (H). The correct formula for phosphine gas must accurately represent the ratio of these elements.
Step 2: Meaning
The options provided are different chemical formulas, each representing a distinct substance. We need to identify which one correctly describes phosphine gas.
Step 3: Analysis
Option A: $\text{PH}_3$ suggests that there is one atom of phosphorus and three atoms of hydrogen. Option B: $\text{P}_2\text{H}_4$ indicates two atoms of phosphorus and four atoms of hydrogen, which does not match the known composition of phosphine gas. Option C: $\text{H}_3\text{PO}_3$ represents a compound with three hydrogen atoms, one phosphorus atom, and three oxygen atoms. This is not phosphine but a different chemical substance. Option D: $\text{H}_3\text{PO}_4$ has the same issue as option C; it contains oxygen in addition to phosphorus and hydrogen. Phosphine gas, also known as phosphane, is composed of one phosphorus atom bonded with three hydrogen atoms. This matches exactly with option A: $\text{PH}_3$.
Step 4: Conclusion
The formula that correctly represents phosphine gas is $\text{PH}_3$. Final Answer: (A)
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