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If the formula of a compound is M2O3 and oxygen has valency 2, then valency of M is
A6
B2
C1
D3
Answer & Solution
Correct answer: D. 3
1. Use criss-cross: subscripts come from swapped valencies.
2. Oxygen 2 became the subscript on M, so M's valency = subscript on O = 3.
3. So valency of M equals 3.
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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