Chemistry- Questions and Answers 26

526. The natural rubber is a linear polymer of?
Isoprene (2-methyl-l, 3-butadiene)

527. The natural rubber is obtained from the ----of the rubber tree?
Latex

528. Who discovered the synthetic rubber?
Mathews & Harris

529. What are the examples of the synthetic rubber?
Thiokol, Neoprene, Buna-N & Buna-S

530. Which synthetic rubber has a superior resistance to vegetable and mineral oils?
Neoprene

531. Which synthetic rubber is used for manufacturing conveyor belts, hoses & gaskets?
Neoprene

532. Which synthetic rubber is resistant to the action of petrol, lubricating oils & organic solvents?
Buna-N

533. Which synthetic rubber is used in making oil seals, tank lining etc?
Buna-N

534. Which synthetic rubber is also known as SBR?
Buna-S

535. Which synthetic rubber is used in the manufacturing of automobile tyres & rubber soles?
Buna-S

536. Which acid is used for coagulating the latex?
Formic acid

537. What should be the percentage of dilution of formic acid before it is added to latex?
0.5 %

538. The heating of rubber with sulphur is known as ------?
Vulcanisation

539. Why rubber is vulcanised?
To make rubber hard, strong & more elastic

540. What is the name of the mixture of calcium cyanamide & carbon?
Nitrolim

541. What is the commercial name of calcium nitrate?
Norwegian saltpetre

542. Which are the important phosphatic fertilisers?
Calcium superphosphate, nitro phosphate & triple phosphate

543. Which kind of fertiliser is Thomas slag?
Phosphatic fertiliser

544. What is the name of the mixture of nitrogenous, phosphatic & potash fertilisers in suitable amounts?
NPK fertilisers

545. Which is the example of a fertiliser available in the gaseous form?
Anhydrous ammonia

546. What are the examples of thermoplastics?
Polythene, nylon, celluloid & polystyrene

547. What are the examples of thermosetting plastics?
Bakelite, melamine, teryleue & glyptal

548. used to kill unwanted plants?
Herbicides

549. Which was the first widely used herbicide?
2,4-D (2, 4- dichlorophenoxyacetic acid)

550. Which type of pesticides are atrazine & glyphosate?
Herbicides

551. The chemicals used to treat lice are known as-------
Pediculicides

552. Malathion & lindane are examples for which type of pesticides?
Pediculicides

553. The category of pest control chemicals intended to kill redents are known as------
Rodcnticides

554. Difethialone & Zinc phosphide are examples for which type of pesticides?
Rodenticidcs

555. Endosulfan is an example of------
Organochlorine insecticide

<Next Page><01,....... 22, 23, 24, 25, 26, 27, 28, 29>
General Science - Questions -> Click here
Physics - Questions -> Click here
Chemistry - Questions -> Click here
Biology - Questions -> Click here
Zoology - Questions -> Click here
Everyday Science - Questions -> Click here
General Science - Questions(Malayalam)- Click here
PSC TODAYS EXAM RESULTS ---> Click here
PSC EXAM PROGRAMME -> Click here
PSC Degree Level Questions & Answers - Click here
PSC LDC/LGS Questions & Answers - Click here
PSC RANK LISTS / SHORT LISTS -> Click here
PSC Solved Question Papers ---> Click here
PSC FREE MOCK TEST -> Click here
PSC/UPSC/SSC/RRB/DEVASWOM EXAM SYLLABUS
- Click here

Related Links

1. CURRENT AFFAIRS ---> Click here

2. GENERAL KNOWLEDGE QUESTIONS (English) ---> Click here
2. GENERAL KNOWLEDGE QUESTIONS (Malayalam) ---> Click here

3. IT, CYBER LAWS AND GENERAL ENGLISH ---> Click here

4. GENERAL SCIENCE - QUESTIONS AND ANSWERS

5. FACTS ABOUT INDIA

6. FACTS ABOUT KERALA

7. FACTS ABOUT WORLD

8. GEOGRAPHY AND ECONOMICS