Question

Write down the chemicals needed to prepare oxygen and hydrogen in laboratory.​

Answer 1

Answer:

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Answer 2

Answer:

Oxygen gas can be prepared in the laboratory by hydrogen peroxide and manganese dioxide. In this reaction manganese dioxide is used as catalyst. The produced oxygen gas is collected in the gas jar by downward displacement of water.

Hydrogen is prepared in the laboratory by the action of the dilute hydrochloric acid or dilute sulphuric acid on granulated zinc.

Explanation:

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