MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
How many atoms are there in one molecule of calcium phosphate?
Think it through first, then pick an option.
- a 3
- b 5
- c 8
- d 13
Answer and explanation
Correct answer: d 13
Ca₃(PO₄)₂: 3 Ca + 2 P + 8 O = 13.
Why the other options are wrong
- a 3: 3 is just the Ca atoms; Ca₃(PO₄)₂ has 3 + 2 + 8 = 13 in all.
- b 5: 5 is the atoms in one PO₄; the 2 outside the bracket doubles it: 13 in all.
- c 8: 8 is only the O atoms (4 × 2); with Ca and P the total is 13.
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