Question

When we put burning candle near the mouth of test tube consisting of sulphuric acid and the pieces of magnesium metal .why does it explode?

Answer 1

Answer:

The explosion is due to the burning of hydrogen gas , which is due to the candle.

Hydrogen gas is evolved from the test tube .

Hydrogen gas burns explosively in the presence of air with a pop sound.

Even this experiment help to detect the presence of hydrogen in the solution

Explanation:

The reaction is as follows:-

Mg + H2SO4 → MgSO4 + H2

Answer 2

Hi there
Her is your answer
Ans) Hydrogen is explosive when mixed with air so burns with explosion near the mouth of gas jar but extinguished out inside the jar because the burning requires the presence of oxygen which in not present inside the jar.
Hope it helps