A chemist opened a cupboard to find four bottles containing water solutions, each of twhich had lost its lable. Bottles 1,2,3 contained colourless solutions , while bottle 4 contained coloured solution. They were, Copper (II) sulphate, Hydrochloric acid. Lead nitrate, Sodium carbonate. By mixing samples of the contents of the bottles, in pairs. The chemist made the following observations, Bottle `1+` Bottle 2 white precipitate Bottle `1=` Bottle 3 white precipitate Bottle `1+` Bottle 4 white precipitate Bottle `2+` Bottle 3 colour less gas evolved Bottle `2+` Bottle 4 no visible reaction Bottle `3+` Bottle 4 blue precipitate. Bottle 3 contains `:`A. Copper (II) sulphateB. hydrochloric acidC. lead nitrateD. sodium carbonate

A chemist opened a cupboard to find four bottles containing water solu

1.	A chemist opened a cupboard to find four bottles containing water solutions, each of twhich had lost its lable. Bottles 1,2,3 contained colourless solutions , while bottle 4 contained coloured solution. They were, Copper (II) sulphate, Hydrochloric acid. Lead nitrate, Sodium carbonate. By mixing samples of the contents of the bottles, in pairs. The chemist made the following observations, Bottle `1+` Bottle 2 white precipitate Bottle `1=` Bottle 3 white precipitate Bottle `1+` Bottle 4 white precipitate Bottle `2+` Bottle 3 colour less gas evolved Bottle `2+` Bottle 4 no visible reaction Bottle `3+` Bottle 4 blue precipitate. Bottle 3 contains `:`A. Copper (II) sulphateB. hydrochloric acidC. lead nitrateD. sodium carbonate
Answer» Correct Answer - 4 Bottle `2+` Bottle 3 `rarr ` Colour less `(CO_(2))` `Na_(2)CO_(3)+` acid `rarr Co_(2)(` Colour lessgas ) Bottle `3+` Bottle `4 rarr ` Blue precipitate confirms `Cu^(+2)` in either bottle. Hence Bottle `3 rarr Na_(2)CO_(3),` Bottle `4 rarr CuSO_(4)` Bottle `2 rarr HCl, ` So Bottle `1 rarr PbNO_(3)`

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