What do you observe when:
(i) Exposure of chlorine water to sunlight
(ii) Addition of barium chloride to sodium sulphate solution
(iii) Carbon dioxide is passed through lime water first and then a little in excess.
(iv) Opening the soda water bottle
(v) Burning sulphur
Answers
exposure of chlorine water to sunlight
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Explanation:
(i) When chlorine water is exposed to sunlight, it produces an odorless and colorless gas called oxygen at standard temperature and pressure.
(ii) When sodium sulphate is added to barium chloride, white precipitate of barium sulphate is immediately formed which is insoluble in diluted HCl.
(iii) When a small amount of CO2 is passed through lime water, it turns lime water milky due to formation of calcium carbonate (CaCO3). Passing CO2 in excess turns the lime water transparent back again due to formation of calcium bicarbonate.
(iv) When the pressure is released by opening the soda container, the liquid cannot hold as much carbon dioxide, so the excess CO2 bubbles out of the solution.
(v) When sulphur is burned, it turns into a gas called sulphur dioxide. The gas can mix with moisture on plants to form an acid that can damage plant leaves. Breathing the gas can be harmful to human health.