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Chemistry

Chemistry
Forth floatation process to concentrate the minerals is applicable to

Bauxite
Calamine
Haematite
Chalcopyrites

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Chemistry
Which of the following is used in welding broken pieces of iron rails and machine parts?

Aluminium sulphate
Solder
None of these
Aluminium powder

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Chemistry
Non-stick kitchenwares are coated with

Graphite
Teflon
Silicon
PVC

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Chemistry
The main active constituent of tea and coffee is

caffeine
nicotine
chlorophyll
aspirin

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Chemistry
The gas which is mainly responsible for the green house effect is:

Ozone
Oxygen
Carbon dioxide
Carbon monoxide

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Chemistry
Colour imparted to the Bunsen flame by strontium salt is

Bluish green
Apple-green
Brick red
Crimson red

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