MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
Which is the formula of ammonium phosphate?
Think it through first, then pick an option.
- a (NH₄)₃PO₄
- b NH₄PO₄
- c (NH₃)₃PO₄
- d NH₃PO₄
Answer and explanation
Correct answer: a (NH₄)₃PO₄
NH₄ is 1 and PO₄ is 3; crossing over puts three NH₄ in a bracket: (NH₄)₃PO₄.
Why the other options are wrong
- b NH₄PO₄: The valencies 1 and 3 are not equal, so it cannot be 1 : 1; three NH₄ are needed.
- c (NH₃)₃PO₄: NH₃ is the ammonia molecule, not a radical; ammonium is NH₄.
- d NH₃PO₄: NH₃ is not the radical and the numbers are wrong too; the answer is (NH₄)₃PO₄.
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