3. When we put burning candle near the mouth of test tube consisting of sulfuric acid &
pieces of magnesium metal, why does it explode?
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the reaction of sulphuric acid and magnesium metal are as follows:
Mg + H2SO4 MgSO4 + H2
Hydrogen gas is evolved from the test tube in this reaction.
When we bring the candle near the mouth of the test tube, this hydrogen gas burns explosively in the presence of air with a pop sound.
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