Chemistry - Study Mode

[#496] The basic chemical building block of natural rubber obtained from trees is
Correct Answer

(A) Isoprene

Explanation

Solution: Natural rubber, also called India rubber, latex, Amazonian rubber, caucho or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water.

[#497] The name of plastic polymer from which combs, toys, bowls etc., can be made, is
Correct Answer

(B) Polystyrene

Explanation

Solution: Polystyrene is an synthetic aromatic polymer made from the monomer styrene, a liquid petrochemical.

[#498] A polymeric substance used to make parachute is
Correct Answer

(B) Viscose

Explanation

Solution: Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is also used as shorthand for Viscose Rayon, thus becoming synonymous with rayon, a soft man-made fibre commonly used in dresses, linings, shirts, shorts, coats, jackets, and other outer wear. It is also used in industrial yarns (tyre cord), upholstery and carpets. Viscose currently is becoming less common because of the polluting effects of carbon disulfide and other by-products of the process, forcing some factories to close. One way to comply with sulphur emission standards is to install a wet sulfuric acid process unit which recovers sulfur compounds to sulfuric acid or use the Lyocell process which uses N-Methylmorpholine N-oxide as solvent.

[#499] PVC is obtained by the polymerisation of
Correct Answer

(B) Vinyl chloride

Explanation

Solution: PVC, in full polyvinyl chloride, a synthetic resin made from the polymerization of vinyl chloride. Second only to polyethylene among the plastics in production and consumption, PVC is used in an enormous range of domestic and industrial products, from raincoats and shower curtains to window frames and indoor plumbing.

[#500] The drug ‘Marijuana’ is a
Correct Answer

(A) Sedative

Explanation

Solution: The drug ‘Marijuana’ is a sedative.