Which of the following are not chemical changes?1. Tempering of iron2 – McqOptions

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1.	Which of the following are not chemical changes?1. Tempering of iron2. Conversion of the iron piece into an electro-magnet by passing the current around the iron3. Melting of iron4. Rusting of ironSelect the correct answer using the code given below:
A.	1 and 2 only
B.	3 and 4 only
C.	1, 2 and 3
D.	1, 3 and 4
Answer» D. 1, 3 and 4

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