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Chemistry

Chemistry
Which of the following type of coal has the lowest proportion of volatile matter ?

Anthracite
Bituminous
Peat
Lignite

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

Na+ > O2- > N3- > F-
O2- > F- > Na+ > N3-
N3- > Na+ > O2- > F-
N3- > O2- > F- > Na+

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Chemistry
The mass of one Avogadro number of helium atom is

8.00 gram
1.00 gram
4 x 6.02 x 1023 gram
4.00 gram

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Chemistry
Inert gases are

Miscible with water
Chemically very active
Not stable
Chemically unreactive

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Chemistry
Which one of the following is extensively used for sterilizing water ?

Bleaching powder
Borax powder
Alum
Soda powder

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Chemistry
The chemical name of 'Hypo' commonly used in photography is

Sodium thiosulphate
Silver nitrate
Sodium nitrate
Silver iodide

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