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Chemistry

Chemistry
The most abundant element by number in the living system is :

Carbon
Oxygen
Nitrogen
Hydrogen

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Chemistry
Setting of plaster of paris involves

Reduction process
Hydration to form other hydrates
Dehydration process
Oxidation process

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Chemistry
CNG used in automobiles to check pollution, mainly consists of

H2
CO2
N2
CH4

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Chemistry
Which one of the following is commonly used for pulp bleaching in the paper industry?

Mild sulphuric acid
Iodine and water
Glucose isomerase
Hydrogen peroxide

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Chemistry
Which is the purest form of iron?

Steel
Wrought iron
Cast iron
Pig iron

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Chemistry
Bee sting contains

An alkaline liquid
A salt solution
A corrosive liquid
An acidic liquid

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