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Chemistry

Chemistry
The purest form of water in nature is

Sea water
Rain water
River water
Lake water

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Chemistry
Basicity of boric acid, H3BO3 is

3
5
2
4

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Chemistry
In galvanization, iron is coated with

Tin
Zinc
Copper
Nickel

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Chemistry
What are the number of moles of CO2 which contains 16 g of oxygen?

0.4 mole
0.2 mole
0.5 mole
0.25 mole

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Chemistry
Which among the following coal contains 90 per cent of carbon?

Peat
Bitumen
Lignite
Anthracite

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Chemistry
Brass gets discoloured in air due to constant exposure in presence of:

Aluminium phosphide
Aluminium sulphide
Hydrogen sulphide
Hydrogenated wafers

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