`6xx10^(-3)` mole `K_(2)Cr_(2) C_(7)` reacts completely with `9xx10^(-3)` mole `X^(n+)` to give `XO_(3)^(-)` and `Cr^(3+)`. The value of `n` is `:`

Options

A. 1
B. 2
C. 3
D. None of these

Answer

1

Explanation

`K_(2)Cr_(2)O_(7)+X^(n+)rarr X^(5+)O_(3)^(-)+Cr^(3+)`
`6xx10^(-3)xx6=(5-n)xx9xx10^(-3)`
`rArr " "n=1`