Chemistry (Part-VII)

Total Questions: 22

21. Which among the following is false about natural rubber? [S.S.C. Online CHSL (T-I) 18.01.2017]

(a) It is an elastomer
(b) It is a monomer of cis-isoprene
(c) Natural rubber is a polymer of chloroprene
(d) It is heated with Sulphur compounds to improve its properties.

Correct Answer: (b) It is a monomer of cis-isoprene

Solution:Natural rubber is a polymer of cis-isoprene, which is formed by polymerization of isoprene (2 methyls 1, 3- buta) and has the chemical formula (C₅H₈)n. Hence, natural rubber cis-1,4 is polyisoprene and not a monomer of cis-isoprene. Hence, option (b) is false.

22. Synthetic detergents are prepared from- [S.S.C. Online Graduate Level (T-I) 7.09.2016]

(a) Potassium salts of higher fatty acids
(b) Sodium salts of higher fatty acids
(c) Hydrocarbons of petroleum
(d) Glycerides

Correct Answer: (c) Hydrocarbons of petroleum

Solution:Hydrocarbons of petroleum are used to prepare synthetic detergents. Like the fatty acids used in the manufacture of soap, petroleum products also contain hydrocarbon chains. When other chemicals such as sulfuric acid and ethylene oxide etc. are reacted with them and also reacted with sodium or potassium hydroxide, a synthetic sanitizer is formed.

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Chemistry (Part-VII)

21. Which among the following is false about natural rubber? [S.S.C. Online CHSL (T-I) 18.01.2017]

22. Synthetic detergents are prepared from- [S.S.C. Online Graduate Level (T-I) 7.09.2016]

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