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Q.

A, B and C are three elements forming part of a compound in oxidation states of +2, +5 and -2 respectively. What could be the compound?

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a

A2(BC)2

b

A2(BC4)3

c

A3(BC4)2

d

ABC

answer is C.

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Detailed Solution

Oxidation states of A,B and C are +2,+5 and -2
Let us substitute these oxidation state each of the compound given
All the compounds given are neutral the algebric sum of oxidations number must be zero
Option :1
A2(BC)2
2(+2) + [+5 -2]2
4+6 = 10
Option:2
A2(BC4)3
2(+2) + [+5+4(-2)]3
4-9 = -5
Option:3
A3(BC4)2
3(+3)+[+5+4(-2)]2
6 - 6 = 0
Option:4
ABC
+2 +5 -2
= +5
The compound A3(BC4)2

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