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Chemistry

Chemistry
Which among the following is pure matter ?

Iron
Carbon–dioxide
Brass
Air

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Chemistry
What is a Bakelite ?

Base
Polymer
Acid
Solution

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Chemistry
Tar roads get damaged if there is

No sloping
Heavy traffic
No maintenance
Stagnation of water on road

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Chemistry
Which one of the following is not a cause for present global warming and climate change ?

Carbondioxide emission
Deforstation
CFC emission
Methane emission

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Chemistry
Colloids can be purified by

Condensation
Dialysis
Condensation
Condensation

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Chemistry
Number of neutrons in an atom of hydrogen is

Zero
Three
One
Two

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