Q. Which of the following is used as laughing gas?
1) Nitrogen trioxide
2) Nitrogen dioxide
3) Nitrous oxide
4) Nitrogen tetraoxide
Q. Which of the following Chemicals is used for fruit ripening?
1) Calcium carbide
2) Sodium chloride
3) Potassium chloride
4) None of the above
Q. Which one of the following is an air pollutant gas and is released by burning of fossil fuel?
1) Nitrogen
2) Hydrogen
3) Oxygen
4) Sulphur dioxide
Q. What is the main constituent of a Pearl?
1) Calcium carbonate only
2) Calcium sulphate only
3) Calcium oxide and calcium sulphate
4) Calcium carbonate and magnesium carbonate
Q. Gypsum (CaSO4.2H2O) is added to clinker during cement manufacturing to
1) a decrease the rate of setting of cement
2) bind the particles of calcium silicate
3) facilitate the formation of colloidal gel
4) impart strength to cement
Q. Which one among the following elements/ions is essential in small quantities for development of healthy teeth butt causes mottling of the teeth if consumed in higher quantities?
1) Fluoride
2) Iron
3) Chloride
4) Potassium
Q. Contact lenses are made from
1) Teflon
2) Polyvinyl chloride
3) polystyrene
4) Lucite
Q. Which one among the following metals is used for making boats because it does no corrode by seawater?
1) Nickel
2) Tungsten
3) Antimony
4) Titanium
Q. Which one among the following is a strong smelling agent added to LPG cylinder to help in the detection of gas leakage?
1) Thioethanol
2) Ethanol
3) Methane
4) Chloroform
Q. Which one among the following substances evolves heat when dissolved in water?
1) Calcium oxide
2) Potassium nitrate
3) Sodium chloride
4) Glucose
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