What do you observe when:
(g) a lighted matchstick is brought near the mouth of the test tube containing hydrogen gas

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Solution

When a lighted matchstick is brought near the mouth of the test tube containing hydrogen gas, it burns with a pop-up sound. It is a chemical change.

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Energy Change in Chemical Reaction

Standard IX Chemistry

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What do you observe when: (g) a lighted matchstick is brought near the mouth of the test tube containing hydrogen gas

When a lighted matchstick is brought near the mouth of the test tube containing hydrogen gas, it burns with a pop-up sound. It is a chemical change.

What do you observe when:
(g) a lighted matchstick is brought near the mouth of the test tube containing hydrogen gas