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Column I lists various impurities in drinking water and Column II lists effects/ diseases caused by these impurities.

Column I

Column II

P. Nitrate > 45 ppm

1. Minamata disease

Q. Mercury > 0.001 ppm

2. Discoloration of teeth

R. Fluoride < 1.0 ppm

3. Cavities in teeth

S. Fluoride > 1.5 ppm

4. Methemoglobenemia

 

5. Pneumoconiosis


The correct match of the column I with column II is
1. P - 4, Q - 5, R - 2, S - 3 
2. P - 4, Q - 1, R - 3, S - 2
3. P - 4, Q - 1, R - 2, S - 3 
4. P - 5, Q - 4, R - 1, S - 2

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Correct Answer - Option 2 : P - 4, Q - 1, R - 3, S - 2

Concept: 

(Impurity in drinking water)

(Harm caused)

Excess of nitrates

Blue babies

Excess of fluorides

Fragile bones

Lack of iodides

Goiter

Excess of chlorides

Brackish water

Excess of sulphates

Laxative Effect

Excess of Mercury

Minamata disease

 

Pneumoconiosis is caused by workplace exposure to dusts in the air that are breathed into the lungs (inhaled).

Asbestos, silica, and coal dust are the most common causes of pneumoconiosis.

Pneumoconiosis can be prevented with appropriate protection.

So the correct option will be (B) P - 4, Q - 1, R - 3, S - 2

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