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Question

Question 23
Find out the wrong statements and write them in their correct form.
(i) We can survive for some time without air but we cannot survive even for a few minutes without food.
(ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution.
(iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel.
(iv) Chlorination is a commonly used chemical method for killing germs in water.
(v) Water which is suitable for drinking is called soft water.

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Solution

(i) The given statement is false.
We can survive for some time without food but we cannot survive even for a few minutes without air.
(ii) The given statement is true.
(iii) The given statement is false.
Carbon monoxide is produced by incomplete burning of fuels such as coal, petrol, diesel.
(iv) The given statement is true.
(v) The given statement is false.
Water which is suitable for drinking is called potable water.


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