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Chemistry

Chemistry
Mercury is emitted into air by

Burning garbage
Coal fire
Steam engine
Burning coal

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Chemistry
Copper is refined by

Oxidation
Electrolysis
Zone refining
Roasting

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Chemistry
The most abundant constituent of atmospheric air is :

Hydrogen
Nitrogen
Carbon
Oxygen

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Chemistry
Which one of the following does not form oxyacid ?

Nitrogen
Chlorine
Sulphur
Fluorine

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Chemistry
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

7.2 x
5x/36
x/6
5x

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Chemistry
Which of the following substance is highly plastic ?

Granite
Clay
Mica
Quartz

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MORE MCQ ON Chemistry

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