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1.

Amongst the following, the total number of compounds soluble in concentrated `NH_(3)` solution is: (A)`Ag_(2)CrO_(4)` , (B)`Cu(OH)_(2).CuSO_(4)` , ( C)`PbSO_(3)` , (D)`Al(OH)_(3)` , (E)`Ni(OH)_(2)` (F)`Zn_(3)(PO_(4))_(2)` , (G)`BaSO_(4)` , (H)`Bi(OH)_(2)NO_(3)` , (I)`Mn(OH)_(2)`

Answer» Correct Answer - 4
(A)`Ag_(2)CrO_(4) darr ("yellow") + NH_(3) to [Ag(NH_(3))_(2)]^(+) +CrO_(4)^(2-)`
(B)`Cu(OH)_(2).CuSO_(4) darr ("blue") + 8NH_(3) to 2[Cu(NH_(3))_(4)]^(2+)+2OH^(-)`
( C)`PbSO_(3) darr ("white") +4OH^(-) to [Pb(OH)_(4)]^(2-) + SO_(3)^(2-)`
Soluble in sodium hydroxide not in `NH_(3)`
(D)Soluble in sodium hydroxide not in `NH_(3)`
(E)`Ni(OH)_(2) darr ("green") + 6NH_(3) to [Ni(NH_(3))_(6)]^(2+) ("deep blue colouration") + 2OH^(-)`
(F)`Zn_(3)(PO_(4))_(2) darr ("white") + 12NH_(3) to 3[Zn(NH+_(3))_(4)]^(2+) + 2PO_(4)^(3-)`
(G)Insoluble in `NH_(3)` soluble appreciably in boiling concentrated `H_(2)SO_(4)`
(H)`Bi(OH)_(2) NO_(3)` is insoluble in `NH_(3)`
(I)Insoluble in `NH_(3)` but soluble in ammonium salts liberating `NH_(3)`
Discussion
2.

An aqueous solution of a mixture of two inorganic salts, when treated with dilute `HCl`, gave a precipitate `(P)` and a filtrate `(Q)`.The precipitate `P` was found to dissolve in hot water. The filtrate `(Q)` remained unchanged, when treated with `H_(2)S` in a dilute mineral acid medium. However, it gave a precipitate `(R)` with `H_(2)S` in an ammoniaca medium.The precipitate `R` gave a coloured solution `(S)`, when treated with `H_(2)O_(2)` in an aqueous `NaOH` medium. The precipitae `P` containsA. `Pb^(2+)`B. `Hg_(2)^(2+)`C. `Ag^(+)`D. `Hg^(2+)`

Answer» Correct Answer - A
Discussion
3.

An aqueous solution of a mixture of two inorganic salts, when treated with dilute `HCl`, gave a precipiate (P) and filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with `H_(2)S` in a dilute mineral acid medium. However, it gave a precipitate (R) With `H_(2)S` in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with `H_(2)O_(2)` in an aqueous `NaOH` medium. The coloured solution S containsA. `Fe_(2)(SO_(4))_(3)`B. `CuSO_(4)`C. `ZnSO_(4)`D. `Na_(2)CrO_(4)`

Answer» Correct Answer - D
Discussion
4.

An aqueous solution of a mixture of two inorganic salts, when treated with dilute `HCl`, gave a precipiate (P) and filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with `H_(2)S` in a dilute mineral acid medium. However, it gave a precipitate (R) With `H_(2)S` in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with `H_(2)O_(2)` in an aqueous `NaOH` medium. The precipitate P containsA. `Pb^(2+)`B. `Hg_(2)^(2+)`C. `Ag^(+)`D. `Hg^(2+)`

Answer» Correct Answer - A
Discussion
5.

Sodium borate on reaction with conc. `H_2 SO_4` and `C_2 H_5 OH` gives a compound A which burns with a green edged flame. The compound A isA. `H_(2)B_(4)O_(7)`B. `(C_(2)H_(5))_(2)B_(4)O_(7)`C. `H_(3)BO_(3)`D. `(C_(2)H_(5))_(3)BO_(3)`

Answer» Correct Answer - 4
Discussion