Statement (A) : Gold exhibits two valencies 2 and 3.
Statement (B) : Tin exhibits two valences 2 and 3.
Statement (C) : Mercury exhibits two valences 3 and 4.

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A and B are correct but C is incorrect

All the above statements are incorrect

A and B are incorrect but C is correct

All the above statements are correct

answer is B.

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Detailed Solution

All the above statements are incorrect

Explanation:

Valency of Gold (Au): Gold typically exhibits valencies of +1 and +3 in its compounds, such as AuCl (gold(I) chloride) and AuCl₃ (gold(III) chloride). It does not commonly exhibit a valency of 2.
Valency of Tin (Sn): Tin exhibits valencies of +2 and +4 in its compounds, such as SnCl₂ (tin(II) chloride) and SnCl₄ (tin(IV) chloride). It does not exhibit a valency of 3.
Valency of Mercury (Hg): Mercury exhibits valencies of +1 and +2 in its compounds, such as Hg₂Cl₂ (mercury(I) chloride) and HgCl₂ (mercury(II) chloride). It does not exhibit valencies of 3 or 4.

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