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Chemistry

Chemistry
Which one of the following mineral does not contain oxygen ?

Calcite
Cryolite
Bauxite
Haematite

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Chemistry
The chemical that is used to ripen mangoes is

Calcium carbonate
Calcium sulphide
Calcium chloride
Calcium carbide

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Chemistry
Which of the following is used as a preservative to protect processed food?

Sodium metabisulphite
BHT
Saccharin
Sodium sulphate

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Chemistry
Impure camphor is purified by

Steam distillation
Fractional crystallisation
Sublimation
Fractional distillation

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Chemistry
German silver, an alloy, does not contain the metal

Nickel
Copper
Zinc
Silver

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Chemistry
Piped Natural Gas (PNG) is used for

Anaesthesia
Welding
Cooking
Mining

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