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1.

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 green precipitate (R) in an ammoniacal medical. The precipitate (R) gave a coloured solution (S), when treated with `H_(2)O_(2)` in an aqueous NaOH medium. Answer Question 62 and 63 The coloured solution (S) containsA. `Fe(SO_(4))_(3)`B. `CuSO_(4)`C. `ZnSO_(4)`D. `Na_(2)CrO_(4)`

Answer» Correct Answer - D
The coloured solution (S) is `Na_(2)CrO_(4)`
The available data suggests that the mixture contains `Pb^(2+)` and `Cr^(3+)` ions. The series of reactions involved are :
Discussion
2.

Which volatile compound burns with green edged flame ?A. `(C_(2)H_(5))_(3)B`B. `(C_(2)H_(5))_(3) BO_(3)`C. `Ba(NO_(3))_(2)`D. `BaCl_(2)`

Answer» Correct Answer - B
`(C_(2)H_(5))_(3)BO_(3)` burns with green edged flame
Discussion