Question

a) Why is combustion reaction an oxidation reaction? (b) How will you test whether the gas evolved in a reaction is hydrogen ? (c) Why does not silver evolve hydrogen on reacting with dillute sulphuric acid ?​

Answer 1

Answer:

(a) combustion requires oxygen.

so the metals which are involved in combustion, get oxidized during the process.

Thus, combustion reaction is an oxidation reaction.

(b) to check the evolution of hydrogen gas, bring a burning matchstick near to the mouth of the test tube.

if the matchstick burns with the pop sound, then there is an evolution of hydrogen gas.

(c) silver is one of the least reactive metals.

so silver is not able to perform the displacement reaction with the dilute sulphuric acid.

as a result the reaction of silver with dilute sulphuric acid does not give out hydrogen gas.

that's the answer to the question.

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