Hydrogen

Chemistry
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Which of the following gas is lightest?

A
Dihydrogen
B
Helium
C
Dinitrogen
D
Dioxygen
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The boiling point of water is :

A
B
C
D
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Water is a ______ oxide.

A
acidic
B
neutral
C
basic
D
amphoteric
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Which of the following process is not used in the concentration of ?

A
Distillation under reduced pressure
B
Evaporation on a water bath
C
Fractional crystallization
D
Sublimation
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Electronic configuration of deuterium is _________.

A
B
C
D
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Concentration of by vacuum distillation gives hydrogen peroxide which is:

A
about pure
B
about pure
C
pure
D
about pure
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is the symbol of:

A
oxide ion
B
superoxide ion
C
peroxide ion
D
monoxide ion
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