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ICSE Class 9 Chemistry Question 15 of 24

Model Question Paper — 2 — Question 10

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10
Question

Question 5(b)

(i) What is the function of ozone in atmosphere ?

(ii) Name a salt whose solubility first increases and then decreases on increasing the temperature.

Answer

(i) The ozone layer acts as a blanket in the atmosphere above 16 km from the earth’s surface. Ozone absorbs the harmful ultra-violet rays coming from the sun and prevents them from reaching the earth’s surface. Thus, it protects the life on earth from harmful effects of ultra-violet rays that can cause skin cancer and destroy many organisms necessary for life in general.

(ii) Hydrated Calcium Sulphate [CaSO4.2H2O]