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Q.

Statement (A) : The common valency of the transition elements is either 2 or 3
Statement (B) : Iron has a variable valency of 2 and 3.
Statement (C) : Valency of non-metals equal to (8 – number of valence electrons)

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a

All the statements are correct

b

All the statements are incorrect

c

A, B are correct and C is incorrect

d

A,B are incorrect and C is correct

answer is A.

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Detailed Solution

Regarding the valency of transition element and non-metals the given three statements are True.

Ex: ${Mn}^{+ 2}, {Co}^{2 +}, {Cu}^{2 +}, {Ni}^{2 +}$

For Oxygen (Z=8), Valence is $8 - 6 = 2$ .

Note: Oxygen is a VIA group element.

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Statement (A) : The common valency of the transition elements is either 2 or 3Statement (B) : Iron has a variable valency of 2 and 3.Statement (C) : Valency of non-metals equal to (8 – number of valence electrons)