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101.

Yellow ammonium sulphide solution is a suitable reagent for the separation of:-A. HgS and PbSB. PbS and `Bi_(2)S_(3)`C. `Bi_(2)S_(3) and CuS`D. `CdS and As_(2)S_(3)`

Answer» Correct Answer - D
`Cd^(+2)` belongs to II A group while `As^(+3)` to II B. All The sulphides of II B are soluble in yellow ammonium sulphide but those of II A are insoluble.
Discussion
102.

A light greenish coloured salt was soluble in water. On passing `H_(2)S` into the solution a black precipiate was obatined which dissolve readily in HCl. The metal ion present isA. `Co^(+2)`B. `Fe^(2+)`C. `Ni^(+2)`D. `Mn^(+2)`

Answer» Correct Answer - B
FeS is soluble in HCl. Also `Fe^(2+)` salts are green.
Discussion
103.

On addition of aqueous NaOH to a salt solution, white gelatinous precipitate is formed, which dissolves in excess alkali. The salt solution containsA. Chromium ionsB. Aluminium ionsC. Barium ionsD. Iron ions

Answer» Correct Answer - B
`Al^(+3)+(OH^(-))_(3)to underset(("white ppt."))(Al(OH)_(3)`
Which is soluble in excess alkali.
Discussion