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Chemistry

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

Haematite
Calcite
Cryolite
Bauxite

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Chemistry
The metal present in vitamin B12 is

Mg
Co
Fe
Mo

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Sedimentation
Filtration
Water softening
Flocculation

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Chemistry
A colloidal system in which a liquid is dispersed in a liquid is called

Sol
Precipitate
Gel
Emulsion

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Chemistry
The example of oligosaccharide is

Sucrose
Ribose
Cellulose
Glucose

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Chemistry
Which of the following is a secondary pollutant ?

SO2
CO
PAN
NO

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