A chemist opened a couborad and found four bottles contaning water solutions, each of which had lost its label. Bottles 1,2,3 contained colourless solutions, while bottle 4 contained a blue solution. The lables from the bottles were lying scattered on the floor of the cupboard. 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 rarr, "White precipitate is formed"),("Bottle 1+ Bottle"3 rarr,"White precipitate is formed"),("Bottle 1+ Bottle" 4rarr,"White precipitate is formed"),("Bottle2+ Bottle"3rarr,"Colourless and odourless gas is evolved"),("Bottle 2+ Buttel" 4rarr,"No visivle reaction is observed"),("Bottle 3+ Bottle" 4rarr,"Blue precipitate is formed"):}`
With the help of the above observations answer the following questions.
Bottle 3 contains:

Options

A. copper (II) sulphate
B. hydrochloric acid
C. lead nitrate
D. sodium carbonate

Answer

D

Explanation

Bottle `4 rArr CuSO_(4)`, Bottle `2+` Bottle 3 `rarr HCI + Na_(2)CO_(3)`
Bottle `1 rArr Pb(NO_(3))_(2)`, Bottle `+1` Bottle `4 rArr PbSO_(4) darr`
Bottle `2 rArr HCI`, Bottle `3 rArr Na_(2)CO_(3)`
(Since, HCI doesn't react with `CuSO_(4))`