Question

1. Select the reaction when the supply of air is very limited a) CH. +20, → CO, +21,0+ Heat b) 2CH, +30, 200, +4H,0+ Heat c) CH, -CH, +70, CO, +6H,0+ Heat d) 2CH, +20, 41,0+ Heat​

Answer 1

Answer:

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green

Explanation:

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