A metal nitrate solution reacts with dilute hydrochloric acid to give a white precipitate which is soluble in concentrated potassium chloride.White pr
A metal nitrate solution reacts with dilute hydrochloric acid to give a white precipitate which is soluble in concentrated potassium chloride.White precipitate on passing of hydrogen sulphide gas is converted into black precipitate.The black precipitate on boiling with hydrogen peroxide (3%) is converted again to a white precipitate which is soluble in ammonium acetate.The cation of the metal nitrate is :
A. `Pb^(2+)`
B. `Ag^(+)`
C. `Hg^(2+)`
D. `Bi^(3+)`
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Correct Answer - A
`Pb^(2+)+2Cl^(-)toPbCl_2darr ("white"), PbCl_2+ 2Cl^(-)to[PbCl_4]^(2-)` (colourless soluble complex )
`PbCl_2darr +H_2StoPbSdarr`(black)+2HCl
`PbS+4H_2O_2toPbSO_4`(white)+`4H_2O`
`PbSO_4darr +2CH_3COONH_4to(NH_4)_2SO_4+(CH_3COO)_2Pb`
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