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Q.

The oxidation state of A, B, and C in a compound are +2, +5, and -2, respectively. The compound is

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a

A2(BC)2

b

A2(BC)3

c

A3(BC4)2

d

A2(BC4)3

answer is C.

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Detailed Solution

A2+B5+C2-Total positive charge = 2x+5yTotal negative charge = 2z∴2x+5y=2z .................. (i) 2x+5y+2z=0 ...............(ii) Solving Eqs. (i) and (ii)  x=3, y=2, z=8 Formula is A3B2C8=A3(BC4)2  Alternatively: Check that the total charge should be zero (1) A2(BC)2=2×2+2×5-2×2 =10( not zero) (2) A2(BC)3=2×2+3×5-2×3 =13 (not zero) (3) A3(BC4)2=2×3+2×5-2×8 =0 (4) A2(BC4)3=2×2+3×5-2×12 =-5 (not zero)
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