Question

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 _________.
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Answer 1

Answer:

(a) Water has maximum density and minimum volume at 4°C.

(b) Freezing mixture contains ice and salt.

(c) The solubility of a gas in water increases with rise in temperature and decreases with rise in pressure.

(d) Rain water is the purest form of natural water.

(e) Use of excessive fertilizers by farmers causes water pollution.

(f) Boiling removes the temporary hardness of water.

(g) Water turns the colour of anhydrous copper sulphate blue.

(h) Water turns the colour of anhydrous copper sulphate scum.