1.

A compound contains three elements A, B and C, if the oxidation number of a+2, B=+5 and C=-2, the possible formula of the compound is

Answer»

`A_(3)(B_(4)C)_(2)`
`A_(3)(BC_(4))_(2)`
`A_(2)(BC_(3))_(2)`
`ABC_(2)`

SOLUTION :Sum of oxidation numbers of all atoms in a neutral molecule is ZERO.
`to A_(3)(B_(4)C):2xx3+2xx[4xx5-2]=42ne0`
`to A_(3)(BC_(4))_(2):+2xx3+2xx[+5-8]=0`
`to A_(2)(BC_(3))_(2):+2xx2+2xx[+5-6]=+2 NE0`
`to ABC_(2):+2+5+(-2)xx2=+3 ne0`


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