Question

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

• A. $A_2(BC_3)_2$
• B. $A_3(BC_4)_2$
• C. $A_3(B_4C)_2$
• D. $ABC_2$

Answer 1

Answer: (B)

$A_3(BC_4)_2$

Answer 2

In $A_3(BC_4)_2 3 x$ oxidation number of $A + 2$ [oxidation number of $B + 4 x$ oxidation number of $C$ ] = 0
$\, \, \, \, \, \, \, \, \, 3 x (+2) + 2 [5 + 4 x (-2)] = 0$
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, 6 + 2 [-31] = 0$