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Chemistry

Chemistry
Which one of the following is not present in cement ?

Alumina
Gypsum
Clay
Alum

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Chemistry
Which one of the following metals is used to galvanise iron ?

Copper
Mercury
Lead
Zinc

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Chemistry
Major portion of the earth’s crust is mainly constituted by

Oxygen and Iron
Silicon and Iron
Silicon and Aluminium
Oxygen and Silicon

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Chemistry
Sea water is saltier than rain water because

Rivers wash away salts from earth and pour them into the sea
Sea beds have salt producing mines
Sea animals are salt producing
The air around the sea is saltish

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Chemistry
Which one of the following is used as preservative for foodstuff ?

Sodium Chloride
Glycerine
Picric acid
Sodium Benzoate

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Chemistry
By-product obtained by soap industry is

Glycerol
Caustic soda
Caustic potash
Naphthalene

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MORE MCQ ON Chemistry

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