How will you detect the presencof carbondioxide and oxygen
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A very common test is the lime water test. In this, the gas is passed to the lime water i.e. Calcium hydroxide which turns milky white on reaction with carbon dioxide.
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Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen.
Carbon dioxide. Carbon dioxide turns limewater milky. A lighted wooden splint goes out in a test tube of carbon dioxide but this happens with other gases, too. So the limewater test is a better choice.
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