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Chemistry

Chemistry
The substance that is added to make natural rubber strong and more bouncy is

Sponge
Sulphur
Polythene
Chlorine

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Chemistry
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

1/4
1/8
1/6
1/3

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Chemistry
Highest percentage of carbon is found in which form of coal?

Peat
Bituminous
Lignite
Anthracite

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Chemistry
Detergents clean surfaces on the principle of

Surface tension
Elasticity
Floatation
Viscosity

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Chemistry
The oxidation number of nickel in K4[Ni(CN)4] is

–4
8
Zero
4

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Chemistry
Chemical name of Gammaxane is

Benzene hexachloride
Aniline
Toluene
Chloro benzene

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