Chemistry
Give one word/words for the following statements:
(a) Water fit for human consumption.
(b) The harmful substances dissolved in water.
(c) The change of states of water from one form to another.
(d) The gaseous form of water found in air.
(e) A mixture of common salt and ice.
(f) A substance which does not contain water in its chemical structure.
(g) A property due to which a substance absorbs water without dissolving.
(h) Water molecules in loose chemical combination with other substances.
Water
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Answer
(a) Potable water
(b) Impurities
(c) Water cycle
(d) Water vapours
(e) Freezing mixture
(f) Anhydrous substance
(g) Hygroscopy
(h) Water of crystallisation
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Related Questions
Fill in the blanks:
(a) Water has ………………… density and …………….. volume at 4°C.
(b) Freezing mixture contains ……………… and ……………. .
(c) The solubility of a gas in water …………….. with rise in temperature and ………………….. with rise in pressure.
(d) ………………. is the purest form of natural water.
(e) Use of excessive ……………… by farmers causes water pollution.
(f) Boiling removes the ………………. hardness of water.
(g) Water turns the colour of anhydrous copper sulphate ………………. .
(h) The sticky substance formed when soap is added to hard water is …………………. .
Match the statements in column A with that in column B.
Column A Column B deliquescent substance sodium bicarbonate hygroscopic substance magnesium chloride efflorescent substance conc. sulphuric acid substance causing temporary hardness washing soda Two gases found dissolved in natural water are
- oxygen and carbon dioxide
- hydrogen and oxygen
- sulphur dioxide and hydrogen
- chlorine and ammonia
Temporary hardness of water can be removed by
- filtering
- boiling
- loading
- none of the above