Which of the following statements are incorrect?
A. Water boils at 100°C.
B. Water than has been filtered through a muslin cloth is safe to drink.
C. Water must be boiled to kill disease causing germs.
D. Water is chlorinated to improve its taste.
E. Sedimentation and adding of alum helps the particles floating in water to settle down.
F. Water evaporates at all temperatures between 0°C and 100°C.

(a) A, B. D
(b) A, C, E
(c) B, C, F
(d) B, D

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Solution

(d) B, D

Statements B and D are incorrect.
Water that has been filtered through a muslin cloth is not safe to drink. Muslin cloth only filters mud. However, this water does contain invisible impurities.
Water is chlorinated to kill harmful microorganisms present in it.

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(d) B, D Statements B and D are incorrect. Water that has been filtered through a muslin cloth is not safe to drink. Muslin cloth only filters mud. However, this water does contain invisible impurities. Water is chlorinated to kill harmful microorganisms present in it.

(d) B, D

Statements B and D are incorrect.
Water that has been filtered through a muslin cloth is not safe to drink. Muslin cloth only filters mud. However, this water does contain invisible impurities.
Water is chlorinated to kill harmful microorganisms present in it.