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Chemistry

Chemistry
Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?

Nitrogen
Helium
Oxygen
Hydrogen

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

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

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Chemistry
Which of the following metals occurs in free state ?

Iron
Copper
Zinc
Lead

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Chemistry
The polymerisation of which often following is used in manufacturing of polythene in industry ?

Ethylene
Acetylene
Styrene
Methane

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Chemistry
Nucleons are regarded as composites sub-particles known as

Quarks
Photons
Mesons
Leptons

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Chemistry
Cement containing excess amount of lime

Is quick setting
Is slow setting
Cracks during setting
Becomes more strong

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