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Chemistry

Chemistry
A polymeric substance used to make parachute is

Cotton
Rayon
Viscose
Terylene

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Chemistry
The minimum energy required for an effective collision is

Free energy
Activation energy
Threshold energy
Internal energy

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Chemistry
The drug ‘Marijuana’ is a

Tranquillizer
Mental stimulant
Sedative
Hallucinating substance

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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
Phosphorus is kept in water because

Its critical temperature is high
Its critical temperature is low
Its ignition temperature is very high
Its ignition temperature is very low

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Chemistry
The mass of one Avogadro number of helium atom is

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

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