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51.

When ferrous sulphate is added to mercuric chloride thenA. `HgCl_(2)` is oxidised to `HgCl_(4)`B. `HgCl_(2)` is reduced to `Hg_(2)Cl_(2)`C. `FeSO_(4)` is oxidised to `Fe_(2)(SO_(4))_(3)`D. `FeSO_(4)` is oxidised to `FeCl_(3)`

Answer» Correct Answer - B,C,D
`6HgCl_(2)+6FeSO_(4)rarr3Hg_(2)Cl_(2)+2Fe_(2)(SO_(4))_(3)+2FeCl_(3)`
Discussion
52.

Which of the following statement is wrong regarding copper sulphate.A. It reacts with KI to give `I_(2)`.B. It reacts with KCI to give `Cl_(2)`.C. Its tartarate complex reacts with NaOH and glucose followed by heating to give `Cu_(2)O`.D. It gives `CuO` on strong heating in air.

Answer» Correct Answer - B
`CuSO_(4)+KClrarrK_(2)SO_(4)+CuCl_(2)`
Discussion
53.

An inorganic sulphate on reaction with very dilute NaOH gave a precipitate which dissolved in excess of NaOH. The resultant dissolved in excess of NaOH. The resultant solution gave the sulphide of the metal when hydrogen sulphide gas was passed through it. The inorganic sulphate isA. `MnSO_(4)`B. `FeSO_(4)`C. `NiSO_(4)`D. `ZnSO_(4)`

Answer» Correct Answer - D
`ZnSO_(4)+NaOH rarr Zn(OH)_(2) overset("Excess NaOH")(rarr)Na_(2)ZnO_(2)`
`Na_(2)ZnO_(2)+H_(2)S rarr Na_(2)S`
Discussion
54.

Which statements are correct regarding copper sulphate ?A. It reacts with NaOH and Glucose to give `Cu_(2)O`B. It reacts with KCl to give `Cu_(2)O`C. It gives CuO on strong heating in airD. It reacts with KI to give brown colouration

Answer» Correct Answer - A,C,D
`underset((M))(Z)overset(dlHNO_(3))(rarr)underset("Colourless solution")(Zn(NO_(3))_(2))underset(NaOH)overset(Ag)(rarr)underset("White ppt")(Zn(OH)_(2))underset(NaOH)overset("Excess")(rarr)underset("Soluble")(Na_(2)[Zn(OH)_(4)])overset(H_(2)S)(rarr)underset("Whiteppt")(Zns)`
Discussion
55.

The pure zince carbonate is prepared by addition of the following reagent to a zinc sulphate solutionA. Sodium carbonateB. Calcium carbonateC. Sodium bicarbonateD. Sodium hydroxide `+` Sodium carbonate

Answer» Correct Answer - C
Addition of `Na_(2)CO_(3)` gives zinc carbonate and zinc hydroxide . `NaHCO_(3)` is an acid salt.
Discussion