Question

when we put the burning candle in the mouth of test tube consist of sulphuric acid and a piece of magnesium metal , why does it explore .
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Answer 1

Explanation:

Ans3) When Sulphuric acid reacts with Magnesium in the beaker, Magnesium sulphate is formed and hydrogen gas is evolved.

H2SO4+Mg---->MgSO4+H2

When a candle is brought near the beaker, it burns with a popping sound due to the presence of hydrogen gas which causes explosion.

Ans4) When Copper Sulphate reacts with the iron nail, Iron displace copper from its compound, as it is more reactive than copper, to form Iron Sulphate.

Fe+CuSO4----->FeSO4+Cu

Thus, the blue colour of the CuSO4 solution fades due to the formation of Ferrous Sulphate.