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Number of oxygen atoms in one molecule of potassium permanganate KMnO4 is
A3
B1
C2
D4
Answer & Solution
Correct answer: D. 4
1. The formula KMnO4 shows 1 K, 1 Mn and O with subscript 4.
2. Subscript gives the number of atoms of that element.
3. So oxygen count is 4.
4. Hence option A is correct.
_Source: Selina Concise Chemistry Class 9, Ch 4 The Language of Chemistry (Mistral OCR'd PDF), section on chemical formula_
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