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Q.

A mixture of two white solids in water give white precipitate with dilute HCl but dissolves on adding conc. HCl. The white precipitate obtained by adding dilute HCl dissolves partly in ammonium hydroxide while the remaining part dissolves in sodium hydroxide. The possible compounds

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a

Zn(NO3)2, AgNO3

b

AgNO3 and Pb(NO3)2

c

Pb(NO3)2 Hg(NO3)2

d

AgNO3 and Mn(NO3)2

answer is B.

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Detailed Solution

Both Ag2+ and Pb2+ gives AgCl and PbCl2 with dil HClboth Ag2+ and Pb2+ gives AgCl2- and PbCl42- with conc. HClIn NH4OH , Ag+  forms soluble complex [Ag(NH3)2]+In NaOH,Pb2+ forms soluble complex  Na2Pb(OH)4
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