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6xx10^(-3) mole K(2)Cr(2) C(7) reacts co...

`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 `:`

A

1

B

2

C

3

D

none of these

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The correct Answer is:
A
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