Chemistry- Questions and Answers 27

556. What is the fullform of DDT?
Dichloro diphenyl trichloroethane

557. In which year the Insecticides Act came into force in India?
1968

558. Which are the four colors used in the toxicity label of pesticides in India?
Red, Yellow, Blue & Green

559. What is the color of the label of the extremely toxic pesticides?
Red

560. Which are the examples of red labelled pesticides?
Zinc phosphide & Monocrotophos

561. What is the color of the label of the pesticides having high toxicity?
Yellow

562. Which are the examples of yellow labelled insecticides?
Endosulfan, carbaryl & quinalphos

563. What is the color of the label of the pesticides having moderate toxicity?
Blue

564. Which are the examples of blue labelled pesticides?
Malathion, glyphosate & thiram

565. Which color is used to label the slightly toxic pesticides?
Green

566. What are the examples of green labelled pesticides?
Mosquito repellant liquids & mancozeb

567. Which polymer is used to make combs, phonograph records, handles of various utensils & electric switches?
Bakelite

568. Which polymer is used to make unbreakable crockery?
Melamine - formaldehyde polymer

569. Which polymer is used in the manufacturing of paints & lacquers?
Glyptal

570. Which is the first fully synthetic fibre developed in 1931?
Nylon

571. Vegetable containing Sulphur:
Cabbage

572. In refrigerators, the liquid used as refrigerant is:
Liquid ammonia

573. The National chemical laboratory is situated in:
Pune

574. The substance that contains the maximum amount of nitrogen is:
Urea

575. The branch of chemistry dealing with the accurate determination of amounts of various substance is called:
Analytical chemistry

576. The gas emitted by burning wood is mainly:
Carbon dioxide

577. Containers for carrying strong acids are made of:
Lead

578. The process of elimination of water from any system is called:
Dehydration

579. The pH of human blood is:
7.4

580. Tetraethyl lead (TEL) is added to petrol for:
Increasing anti-knocking rate

581. The number of isotopes in which hydrogen can exist are:
3

582. The gas used in fire extinguishers is:
Carbon dioxide

583. Which element is present in all acids?
Hydrogen

584. Which pair of metalis used in the manufacture of stainless steel?
Chromium and steel

585. In order to lower the temperature below 0° C, the substance mixed with ice is:
Sodium chloride
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