UPSC NDA I 2011 General Ability Paper

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Question : 137 of 150

Marks: +1, -0

Iron nails are dipped into blue copper sulphate solution. After some time iron nails are:

dissolved and blue colour is discharged.
dissolved but blue colour is not discharged.
not dissolved but blue colour is not discharged.
not disssolved but blue colour is discharged.

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