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Chemistry

Chemistry
Number of neutrons in an atom of hydrogen is

Three
Zero
Two
One

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Chemistry
Silicon is a

Insulator
Semiconductor
Nonconductor
Conductor

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Chemistry
What is the covalency of nitrogen in ammonia molecule

3
2
4
5

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Chemistry
The name of plastic polymer from which combs, toys, bowls etc., can be made, is

Polystyrene
Teflon
Metallic polysulphides
Polyurethane

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Chemistry
Which of the following metals occurs in free state ?

Iron
Lead
Zinc
Copper

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Chemistry
Which is known as carbolic acid?

Acetic acid
Phenol
Ethanol
Oxalic acid

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