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A sample of an alloy weighing 0.50 g and...

A sample of an alloy weighing `0.50 g` and containing 90% `Ag` was dissolved in concentrated `HNO_(3)`. `Ag` was analysed by volhard method in which `25 mL` of `KCNS` was required for complete neutralisation. Determine the normality of `KCNS`.

Text Solution

Verified by Experts

The correct Answer is:
A
Weight of `Ag = (90 xx 0.5)/(100) = 0.45 g`
mEq of `Ag = mEq of KCNS`
`("Weight of" Ag)/(Ew of Ag) xx (1000) = "Volume in mL" xx N`
`= (0.45 xx 1000)/(108) = 25 xx N`
`:. N = 0.167`
`(Ag overset(HNO_(3))(rarr) AgNO_(3) overset(KCNS)(rarr) AgCNS)`
(mEq of `Ag = mEq of AgNO_(3) = mEq of Ag CNS`)
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Knowledge Check

  • 0.7 g of Na_(2)CO_(3).xH_(2)O was dissolved in water to make 100 mL solution, 20 mL of this solution required 19.8 mL of 0.1 N HCl for complete neutralisation. The value of x is :

    A
    5
    B
    2
    C
    3
    D
    4