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Assigning Oxidation Numbers

Oxidation num...

Question

Oxidation numbers of $A, B, C$ are $+ 2, + 5$ and $- 2$ respectively. the possible formula of the compound is:

A

A_{2} (B C_{2})_{2}

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B

A_{3} (B C_{4})_{2}

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C

A_{2} (B C_{3})_{2}

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D

A_{3} (B_{2} C)_{2}

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Solution

The correct option is B $A_{3} (B C_{4})_{2}$
By trial and error methode,

$A_{3} (B C_{4})_{2}$
overall compound should be neutral,Let's check
Charge on $A = 3 \times 2 = + 6$
Charge on $(B C_{4})_{2} = 5 + (- 8) \times 2 = - 6$

Hence, the correct option is $B$

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