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Chemistry

Chemistry
Mercury is emitted into air by

Steam engine
Coal fire
Burning coal
Burning garbage

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Chemistry
Which one is the lightest element in the periodic table

Helium
Carbon
Oxygen
Hydrogen

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Chemistry
Which of the following molecules has a bond order of 2.5

CO
HCL
NO
F2

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Chemistry
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

p-electrons in Ne(Z = 10)
s-electrons in Mg(Z = 12)
d-electrons in Fe(Z = 26)
p-electrons in CI(Z = 17)

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Chemistry
Who modified Bohr's theory by introducing elliptical orbits for electron path

Thomson
Sommerfeld
Hund
Rutherford

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Chemistry
Acid rain is caused due to emission of which of the following in to the atmosphere ?

Carbon dioxide and carbon monoxide
Carbon monoxide and nitrogen
Ozone and carbon dioxide
Oxides of nitrogen and sulphur

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