Question

1. A zinc rod is left for nearly 20 minutes in a copper sulphate solution. What change would you observe in zinc rod?
2. What type of reaction is this: Na2SO4 + BaCl2  BaSO4 + 2NaCl
3. What is rust?
4. How does the food become rancid?
5. An iron knife kept dipped in a blue copper sulphate solution turns the blue solution light green. Why?

Answer 1

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