Question

Test these gases one by one by bringing a burning candle close
to the mouth of the test tubes.
What happens in each case?
Which gas is present in each test tube?




why candle is brought near the tedt tubes​

Answer 1

If this gas be then conducted into a test-bulb in which there is a piece of heated potassium, and the gas which leaves the tube be collected in a small jar,* it will be found by the usual.