alleryStart learning →Which element has variable valency in its compounds?
AIron, +2 and +3
BSodium, +1 fixed
CPotassium, +1 fixed
DAluminium, +3 fixed
Answer & Solution
Correct answer: A. Iron, +2 and +3
1. The chapter lists elements with variable valency.
2. Iron forms Fe2+ (ferrous) and Fe3+ (ferric) compounds.
3. Sodium, potassium and aluminium have fixed valency.
4. So iron is the right answer.
_Source: Selina Concise Chemistry Class 9, Ch 4 The Language of Chemistry (Mistral OCR'd PDF), section on variable valency_
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