Q: 41 (CAPF/2012)

When an iron nail is dipped in a solution of copper sulphate, the iron nail becomes brownish in colour and the blue colour of copper sulphate solution fades after some time. The reaction is an example of chemical
question_subject: 
Science
question_year: 
2012
question_exam: 
CAPF
stats: 
0,240,504,88,120,296,240