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Chemistry

Chemistry
The value of Avogadro Number is

6.023 × 1022
6.023 × 1024
6.023 × 1025
6.023 × 1023

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Chemistry
Hardest allotrope of carbon is

Diamond
Graphite
Coke
Lamp black

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Chemistry
Which of the following gases will effuse out of football bladder most quickly ?

H2
O2
He
N 2

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Chemistry
Which gas emitted by power stations causes acid rain?

Nitrogen
Sulphur dioxide
Helium
Carbon dioxide

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Chemistry
The material used in the manufacture of lead pencil is

Graphite
Lead
Carbon
Mica

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Chemistry
________ is used for making vinegar.

Tartaric acid
Malic acid
Oxalic acid
Acetic acid

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