write a name of an element having variable valency.
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Answer:
List of elements having variable valency
Explanation:
Iron : → ferrous - Fe 2+ → ferric - Fe 3+
Copper : → cuprous - Cu + → cupric - Cu 2+
Mercury. → mercurous - Hg + → mercuric - Hg 2+
Gold. → aurous - Au + → auric - Au 3+
Silver. → argentous - Ag + → argentic - Ag 2+
Lead. → plumbous - Pb 2+ → plumbic - Pb 4+
Platinum. → platinous - Pt 2+ → platinic - Pt 4+
Tin.
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Answer:
What is Variable Valency?
Sometimes, because of different conditions under which a chemical reaction takes place, the valency of the same element changes. Thus metals like lead, tin, copper, mercury, iron etc exhibit variable valency
Explanation:
refer this attachment
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