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Chemistry

Chemistry
The weight of 6.023 × 1022 atoms of carbon is

12 gms
1.2 gms
120 gms
0.12 gms

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Chemistry
The metal that is usually extracted from sea water is

Ca
Mg
K
Na

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Chemistry
Non-stick kitchenwares are coated with

Graphite
PVC
Silicon
Teflon

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Chemistry
Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?

Nitrogen
Helium
Hydrogen
Methane

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Chemistry
The product, 9-nitroanthracene is obtained from anthracene by the action of

Nitric acid and acetic acid
Nitric acid in excess
Nitric acid and acetic anhydride
Nitric acid and ethyl alcohol

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Chemistry
The acid which fails to liberate carbon dioxide from sodium bicarbonate is :

Carbonic acid
Acetic acid
Sulphuric acid
Formic acid

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