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Chemistry

Chemistry
Threshold limit value of copper in the atmospheric air is

0.001 mg/m3
5.0 mg/m3
1.0 mg/m3
0.01 mg/m3

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Chemistry
Chemical name of common salt is

Sodium Chloride
Sodium
Sodium Oxide
Sodium Bicarbonate

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Chemistry
Which of the following is the petroleum wax ?

Carnauba wax
Jojoba wax
Paraffin wax
Bees wax

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Chemistry
Copper is refined by

Oxidation
Roasting
Zone refining
Electrolysis

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Chemistry
When quick lime is added to water

Temperature decreases
Heat is liberated
Heat is absorbed
No heat change takes place

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Chemistry
The acid which is secreted by the glands in the stomach wall is

Phosphoric acid
Sulphuric acid
Nitric acid
Hydrochloric acid

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