Chemistry- Questions and Answers 25

496. Which acid is present in the urine of the horses?
Hippuric acid

497. Which chemical is used to make power glues & superglues?
Cyanoacrylate

498. Which metal is used in the catalytic converters in cars to reduce the pollution from exhaust gases?
Platinum

499. What is the most widely used food additive to prevent botulism?
Sodium nitrite

500. What is the commonly used radio wave frequency in the microwave ovens to heat food?
2,500 megahertz

501. Which chemical was historically known as 'magnesia alba'?
Magnesium oxide (Magnesia)

502. Which chemical is also known in the nickname of'the English Salt'?
Magnesium sulphate

503. The presence of which biological molecules are detected through the Molisch's test?
Carbohydrates

504. What was the major invention made by the American physicist Chester Carlson?
Xerography

505. Which chemical is also known as 'the Oil of Wintergreen'?
Methyl Salicylatc

506. What causes the foul smell of the rancid butter?
Butyric acid

507. Which compound of silver is used in the silvering of mirrors?
Silver nitrate

508. What are the examples for natural polymers?
Cellulose, starch, rubber, wool & silk

509. What are the examples for synthetic polymers?
Polythene, nylon, dacron & orion

510. The polymers soften on heating and become hard on cooling & can be remoulded, recast and reshaped are known as-----
Thermoplastics

511.The polymers that can only be moulded into desired shape on heating once & cannot be reused are known as------
Thermosetting plastics

512. Which is the semi-synthetic polymer obtained by chemical treatment of wood pulp (cellulose)?
Rayon

513. What is known as Artificial silk'?
Rayon

514. What is the type of polymerisation in which simple monomers are united together without loss of small molecules?
Addition polymerisation

515. Name the important addition polymers?
Polythene, tefton, thermocol, polypropylene, orion & carbon fibres

516. Which type of polymer is obtained by polymerisation of ethylene?
Polythene (Polyethylene)

517. Which polymer is used in the insulation wires and manufacturing of squeeze bottles, toys, flexible pipes and buckets?
Polythene

518. Which type of polymer is obtained by the polymerization of tetrafluoro ethylene?
Teflon

519. Which type of polymer is used as a substitute for wool in making commercial fibres?
Orlon (Acrilon)

520. Which type of polymer is used in indoor/outdoor carpetting and upholstery?
Polypropylene

521. Which type of polymers are stronger than steel, stiffer than titanium and lighter than aluminium?
Carbon fibres

522. Which type of polymer is used in defence sector as nose tips and head shields of missiles?
Carbon fibres

523. What are the examples of condensation polymers?
Bakelite, Glyptal, Nylon

524. In which type of polymerisation is simple monomers are joined together with loss of small molecules like water & ammonia?
Condensation polymerisation

525. What is obtained by the condensation polymerisation of phenol and formaldehyde?
Bakelite
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