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CHEMISTRY

Chemistry
Gypsum is used for improvement of:

Saline soils
Acidic soils
Alkaline soils
Podsols

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Chemistry
Which of the following laser types is used in a laser printer?

Dye laser
Semiconductor laser
Excimer laser
Gas laser

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Chemistry
The chemical that is used to ripen mangoes is

Calcium sulphide
Calcium carbide
Calcium carbonate
Calcium chloride

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Chemistry
Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as

Synergism
Independent
Additives
Antagonism

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Chemistry
Which of the following is used to remove ink and rust stains on cloth?

Kerosene oil
Oxalic acid
Ether
Alcohol

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