MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
What is the correct formula of phosphonium phosphate?
Think it through first, then pick an option.
- a PH₄PO₄
- b PH₄(PO₄)₃
- c (PH₄)₂PO₄
- d (PH₄)₃PO₄
Answer and explanation
Correct answer: d (PH₄)₃PO₄
PH₄ is 1 and PO₄ is 3; crossing over gives (PH₄)₃PO₄.
Why the other options are wrong
- a PH₄PO₄: The valencies are 1 and 3, not equal; three PH₄ are needed.
- b PH₄(PO₄)₃: The 3 went the wrong way: phosphate's 3 belongs under PH₄.
- c (PH₄)₂PO₄: No 2 comes from anywhere; phosphate's valency is 3, so (PH₄)₃.
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