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Chemistry

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

Fe3O4
FeCO3
Fe2O3
FeS2

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Chemistry
The chemical used in developing photographic films is

Hydroquinone
Sodium sulphate
Silver bromide
Hypo

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Chemistry
Thermal electricity is generated by using which of these ?

Coal, Natural Gas and Petroleum
Coal only
Coal and Natural Gas only
None of these

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Chemistry
Urea is a

Sodium fertilizer
Potassium fertilizer
Nitrogenous fertilizer
Phosphatic fertilizer

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Chemistry
The common refrigerant in domestic refrigerator is

Freon
Neon
Oxygen
Nitrogen

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Chemistry
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

2 : 16 : 2
1 : 16 : 2
1 : 1 : 1
2 : 16 : 1

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