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Chemistry

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

Sulphur
Sponge
Polythene
Chlorine

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Chemistry
Slag is a name given for

Molten calcium silicate
Molten iron
Molten alumina
Molten sand

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Chemistry
The rusting of iron is a/an

None of these
Physical change
Electrical change
Electrochemical change

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Chemistry
Hardness of the water is commonly measured in terms of

Calcium carbonate equivalents
Magnesium carbonate equivalents
Calcium sulphate equivalents
Magnesium sulphate equivalents

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Chemistry
Heavy metal pollution of water is caused by:

Domestic sewage
Paints
Wood burning
Acid Plants

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Chemistry
Which one is heaviest naturally-occurring element of the periodic element

Iron
Uranium
Thorium
Rhodium

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