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Chemistry

Chemistry
24 carat of diamond is equal to

95% mg
91% gold
200 g
200 mg

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Chemistry
The substance that is added to make natural rubber strong and more bouncy is

Sulphur
Polythene
Chlorine
Sponge

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Chemistry
Cement is made hard with

Polymerisation
Dehydration
Dissociation of water
Hydration and dissociation of water

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Chemistry
Main pollutants released from iron and steel industry are

CO2, H2S and NO2
CO2, NO2 and SO3
NO, SO3 and H2S
CO, CO2 and SO2

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Chemistry
Milk is a

Mixture
Element
Metal
None of these

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Chemistry
Number of6.023 × 1020 atoms present in one mole of a gas at STP is

'6.023 × 10–23
6.023 × 1023
6.023 × 1020
'6.023 × 10–20

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