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Chemistry

Chemistry
What is the atomic number of mercury

32
80
41
63

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Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

Smaller atomic radius
Stable half filled 2p sub level
High bond dissociation energy
High nuclear charge

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Chemistry
Which one is heaviest naturally-occurring element of the periodic element

Rhodium
Thorium
Iron
Uranium

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

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

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Chemistry
Carborundum is another name of

Silicon oxide
Calcium oxide
Calcium carbide
Silicon carbide

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Chemistry
Phosphorus is kept in water because

Its critical temperature is high
Its ignition temperature is very high
Its critical temperature is low
Its ignition temperature is very low

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