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Chemistry

Chemistry
Which one is a naturally occuring noble gas

Sodium
Boron
Argon
Potassium

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Chemistry
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

13 days
0.01 minute
3 billion years
100 years

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Chemistry
Nucleons are regarded as composites sub-particles known as

Mesons
Photons
Quarks
Leptons

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Chemistry
Mixture can be

Heterogeneous
Pure substance
Both A and B
Homogeneous

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Chemistry
Which of the following fibres catches fire least ?

Cotton
Terricot
Nylon
Rayon

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Chemistry
Milk tastes sour when kept in the open for sometime due to the formation of

Citric acid
Lactic acid
Acetic acid
Carbonic acid

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