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Chemistry

Chemistry
Which one of the following is not present in cement ?

Clay
Alumina
Gypsum
Alum

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Chemistry
Heavy metals got their name because compared to other atoms they have

Higher atomic numbers
Higher densities
Higher atomic radii
Higher atomic masses

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Chemistry
PVC is obtained by the polymerisation of

Vinyl chloride
Acetylene
Styrene
Propane

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Chemistry
Ultra purification of a metal is done by :

Zone melting
Smelting
Leaching
Slugging

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Chemistry
Which one is the most reactive halogen

Fluorine
Chlorine
Bromine
Iodine

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Chemistry
0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

3
7
4
6

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