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Chemistry

Chemistry
The chief source of naphthalene is

Diesel
Coal-tar
Charcoal
Camphor

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Chemistry
Gelatin is mostly used in making ice–creams in order to

Enrich the aroma
Prevent making a colloid
Stabilise mixture
Stabilise the colloid and prevent crystallisation

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Chemistry
Which one of the following vegetable oils is used in the manufacture of paints?

Sunflower oil
Linseed oil
Cottonseed oil
Palm oil

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Chemistry
The percentage of carbon in cost iron is :

3 to 5
6 to 8
0.01 to 0.25
0.5 to 1.5

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Chemistry
Oxygen which is vital for life is a product of photosynthesis and comes from

Water
Carbonates from soil
Carbon dioxide
Oxides of mineral elements

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Chemistry
The method that cannot be used for removing permanent hardness of water is

distillation
boiling
adding caustic soda
adding sodium carbonate

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