Q: 105 (CAPF/2014)

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Which of the following are not chemical changes ?
1. Tempering of iron
2. Conversion of iron piece into an electro-magnet by passing the current around the iron
3. Melting of iron
4. Rusting of iron
Select the correct answer using the code given below :
question_subject: 
Science
question_year: 
2014
question_exam: 
CAPF
stats: 
0,440,440,256,128,440,56