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Chemistry

Chemistry
Which of the following is not a precious/semi-precious stone?

Emerald
Ruby
Pearl
Sapphire

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Chemistry
'Vinegar' is a commercial name of

Oxalic acid
Citric acid
Acetic acid
Hydrochloric acid

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Chemistry
Which of the following is not a natural source of hydrocarbon?

Petroleum
Coal
Mica
Natural Gas

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Chemistry
Which among the following is pure matter ?

Air
Iron
Brass
Carbon–dioxide

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Chemistry
The main buffer system of the human blood is

H2CO3 - HCO3
H2CO3 - CO32-
NH2CONH2 - NH2CONH+
CH3COOH - CH3COO-

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Chemistry
Which one of the following is used to restore the colour of old oilpaintings ?

Hydrogen peroxide
Ozone
Sodium peroxide
Barium peroxide

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MORE MCQ ON Chemistry

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