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If K(2)Cr(2)O(7) is source of Cr(2)O(7)^...

If `K_(2)Cr_(2)O_(7)` is source of `Cr_(2)O_(7)^(2-)`, what is the normality of solution containing `4.9 g` of `K_(2)Cr_(2)O_(7)` in `0.1` litre of solution?

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The correct Answer is:
1
Normality of `K_(2)Cr_(2)O_(7) = (w)/(E xx V("in litre"))`
`= (4.9)/((294//6) xx 0.1) = 1N (because E_(K_(2)Cr_(2)O_(7)) = (M)/(6))`
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Dichromate ion in acid solution oxidizes stannous ion as: 3Sn^(2+)+14H^(+)+Cr_(2)O_(7)^(2-)rarr3Sn^(+)+2Cr^(3+)+7H_(2)O (a) If SnCl_(2) is the source of Sn^(2+) , how many g of SnCl_(2) would be contained in 2 "litre" of 0.1N solution? (b) If K_(2)Cr_(2)O_(7) is the source of Cr_(2)O_(7)^(2-) , what is the normality of solution containing 4.9 g K_(2)Cr_(2)O_(7) in 0.1 "litre" of solution?

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