Question

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Answer 1

Answer:

Ok......,

Explanation:

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Answer 2

Answer:

Qa.

I. Because it is not in the contact of O2 gas.

ii. Anhydrous CaCl2 is added to test tube because it is anhydrous and can absorbs moisture or water.

iii. We get the unrusted nail in the conclusion.

Qb.

I. Iron present in the iron nail reacts with CuSO4 by which its colour changes from blue to green

ii. 2Fe + CuSO4 »» Fe2SO4 + Cu

Explanation:

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