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Chemistry

Chemistry
The gas which turns into liquid at the lowest temperature among the following is

Nitrogen
Hydrogen
Oxygen
Helium

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Silicosis
Cancer
Asthma
Pneumoconiosis

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Chemistry
Hardness of the water is commonly measured in terms of

Calcium sulphate equivalents
Magnesium carbonate equivalents
Magnesium sulphate equivalents
Calcium carbonate equivalents

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Chemistry
For generation of biogas, the materials commonly used are

Crop residues
Forest residues
Animal wastes
Aquatic plants

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Chemistry
The apparatus used to test acidity of aqueous solution is

PH meter
Hygrometer
Acidmeter
Ammeter

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Chemistry
The most abundant element in the earth’s atmosphere is

Nitrogen
Krypton
Argon
Oxygen

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