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Question

A colourless aqueous solution contain nitrates of two metal, when it is added to an aqueous solution of NaCl, a white precipitate ws formed. This precipitate was found to be partially soluble in hot water to give a residue P and a solution Q. The residue P was solublein aq. in NH3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are:

A
Ag and Pb
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B
Ag and Cd
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C
Cd and Pb
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D
Cd and Zn
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Solution

The correct option is A Ag and Pb
x=Ag; y=Pb; P=AgCl: Q=PbCl2
(1) AgNO3+NaClAgCl+NaNO3xP

(2) AgCl(s)+2NH3[Ag(NH3)2]+Cl(P)(soluble complex)

(3) AgCl+2Na2S2O3Na3[Ag(S2O3)]+NaClResidue P(Excess)(Soluble complex)
(4)
Pb(NO3)2+2NaClPbCl2+2NaNO3(y)white ppt (Q)

(5) PbCl2+2KIPbI2+2KCl(hot solution)yellow pptQ


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