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(i) Put a mixture of calcium hydroxide and ammonium chloride into a test-tube to a depth of
4 cm. Fill a U-tube with lumps of calcium oxide mixed with cotton wool. The cotton wool is to
prevent blocking of the tube. Gently heat the test-tube. The calcium oxide dries the
ammonia gas. Test whether the receiver test-tube is full by holding a piece of red litmus
paper at the opening. Collect test tubes of ammonia and cork them. The method of
collection illustrates that ammonia gas is lighter than air.
(ii) Fill a flask with ammonia. Fit a cork and tube into the flask as shown. The tube should
have been drawn out into a jet. Warm the flask gently to expand the gas and then hold the
flask upside down with the tube in the water. Water will spray into the flask from the jet.
sharon kalunda answered the question on April 12, 2019 at 07:26
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