Question

What happens when
1.Lead nitrate crystals are heated strongly.
2.A clean iron nail is placed in a test tube containing copper sulphate solution
3.A burning magnesium ribbon is placed in a jar of steam

Answer 1

2. a clean iron nail is placed in a test tube .

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Answer 2

Explanation:

1 When lead nitrate crystals are heated strongly, a reddish brown coloured gas is released. This is nitrogen dioxide gas. It has an irritating odour. It turns moist blue litmus red

2 When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.