# The ratio of amounts of H2S needed to precipitate all the metals ions from 100 ml of 1 M AgNO3 and 100 ml of 1 M CuSO4 is : Option 1) 1:2 Option 2) 2:1 Option 3) Zero Option 4) Infinite

As discussed in

Mole Fraction -

It is ratio of moles of solute or moles of solvent to moles of solution.

- wherein

If a substance ‘A’ dissolves in substance ‘B’ and their number of moles are nA and nB respectively; then the mole fractions of A and B are given as

Mole fraction of A = (number of moles of A)/(number of moles of solution ) = nA/(nA+ nB)

$2 AgNO_{3}+H_{2}S \rightarrow Ag_{2}S+2HNO_{3}$

1 Molel H2S react with 2moles AgNo3

ratio (H2S:AgNO3)1:2

$CUSO_{4}+H_{2}S\rightarrow CuS+H_{2}SO_{4}$

$Ratio(H_{2}S:CuSO_{4})=1:1$

$Required\: Ratio =\frac{\frac{1}{2}}{\frac{1}{1}}$

$=1:2$

Option 1)

1:2

Option is Correct

Option 2)

2:1

Option is incorrect

Option 3)

Zero

Option is incorrect

Option 4)

Infinite

Option is incorrect

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