Question

1.Which of the following rivers is called the world’s most polluted river?
(a) Ganga River
(b) Chenab River
(c) Cauvery River
(d) Yamuna River
2. Which of the following techniques is used for reducing the total dissolved solids (TDS) in the water?
(a) Osmosis
(b) Ion exchange
(c) Distillation
(d) Both b and c
3. Which of the following salts is the main cause of permanent hardness of water?
(a) Magnesium sulphate
(b) Magnesium bicarbonate
(c) Magnesium carbonate
(d) None of the above

4. Chlorofluorocarbon are nonflammable chemicals mainly used in _________.
(a) Perfumes
(b) Refrigerators
(c) Air conditioners
(d) All of the above

5.What are the health effects of excess fluoride in drinking water?
(a) Fluorosis
(b) Toothaches
(c) Lung disease
(d) Intestinal infection. ​

Answer 1

Answer:

1. (a) Ganga River.
2. (d) Both b and c.
3. (a) Magnesium sulphate.
4. (d) All of the above.
5. (a) Fluorosis.

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Answer 2

Explanation:

Ganga river

Both a and b

Magnesium sulphate

all of these

fluorosis