Question

4. When a base reacts with a metal, it forms a salt and
hydrogen gas is released. By what method the presence of
hydrogen can be detected?​

Answer 1

Explanation:

How can we test for the presence of hydrogen gas? ... When hydrogen gas is released in a reaction it will immediately rise up, because hydrogen ...

The first sign to look out for is bubbles. The presence of bubbles signals that a gas is formed during the reaction. To confirm whether the gas is hydrogen, collect a small amount in a test tube. Hold a glowing splint at the opening of the test tube when you release the gas

Answer 2

CHEMICAL REACTIONS OF BASE -

• Base dissolves in water to form an alkali.
• Base reacts with acids to form salt by a neutralization reaction.
• When a base reacts with a metal, it forms a metal salt, and hydrogen gas is released.
• The reaction is given as - Metal + Base → Metal salt + Hydrogen gas
• The presence of hydrogen gas can be detected by the popping sound heard when a lit candle is brought near the mouth of the test tube in which the reaction is carried out.