Redox Reactions - Result Question 8

####8. A compound contains atoms of three elements A,B and C. If the oxidation number of A is +2,B is +5 , and that of C is -2 , the possible formula of the compound is :

[2000]

(a) A2(BC3)2

(b) A3(BC4)2

(c) A3(B4C)2

(d) ABC2

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Solution:

  1. (b) Oxidation number of a compound must be 0 . Using the values for A,B and C in the four options we find that A3(BC4)2 is the answer.

Check : (+2)3+[(+5)+4(−2)]2=6+(5−8)2=0

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