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 :
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(a) $A_2(B C_3)_2$
(b) $A_3(B C_4)_2$
(c) $A_3(B_4 C)_2$
(d) $A B C_2$
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Solution:
- (b) Oxidation number of a compound must be 0 . Using the values for $A, B$ and $C$ in the four options we find that $A_3(B C_4)_2$ is the answer.
Check : $(+2) 3+[(+5)+4(-2)] 2=6+(5-8) 2=0$
