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Chemistry

Chemistry
Forth floatation process to concentrate the minerals is applicable to

Bauxite
Chalcopyrites
Haematite
Calamine

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Chemistry
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

helium
ozone
methane
oxygen

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Chemistry
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume

Conc. HCl and conc. HNO3
Dil. HCl and dil. HNO3
Conc. HNO3 and conc. H2SO4
Conc. HNO3 and conc. HCl

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Chemistry
The main constituent of natural gas is

Butane
Ethane
Propane
Methane

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Chemistry
Which one of the following is found in kidney stones?

Calcium oxalate
Sodium oxalate
Sodium chloride
Calcium acetate

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Chemistry
The rusting of iron is a/an

Electrical change
None of these
Physical change
Electrochemical change

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