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Chemistry

Chemistry
In which of the following states maximum iron ore is found ?

FeCO3
Fe2O3
Fe3O4
FeS2

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Chemistry
The main component of liquid bleach is:

Hydrochloric acid
Sodium chloride
Sodium hypochlorate
Sodium hypochlorite

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Chemistry
Tar roads get damaged if there is

No maintenance
No sloping
Stagnation of water on road
Heavy traffic

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Chemistry
The total energy of revolving electron in an atom

Will always be positive
Can have any value above zero
Cannot be negative
Can never be positive

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Chemistry
The main buffer system of the human blood is

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

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Chemistry
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

levigation
leaching
magnetic separation
liquation

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