MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
How many atoms are there in all in a molecule of the compound calcium phosphate?
Think it through first, then pick an option.
- a 8
- b 11
- c 13
- d 17
Answer and explanation
Correct answer: c 13
Ca₃(PO₄)₂: 3 Ca + 2 P + 8 O = 13.
Why the other options are wrong
- a 8: 8 is only the O atoms (2 × 4); with Ca and P the total is 13.
- b 11: 3 Ca and 8 O make 11; the 2 P atoms were left out. The total is 13.
- d 17: 17 is the atom count of Al₂(SO₄)₃ (2 + 3 + 12); calcium phosphate has 13.
More board questions on this topic
- Which is the correct formula of boron nitride?
- How many atoms are there in a nitrogen molecule?
- How many atoms are there in one molecule of calcium phosphate?
- Whose molecule is triatomic?
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