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Chemistry

Chemistry
The number of electrons presents in H+ is

one
zero
two
three

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Chemistry
Global warming is mainly due to accumulation of

Carbon dioxide
Carbon monoxide
Oxides of sulphur
Oxides of nitrogen

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Chemistry
Percentage of lead in lead pencils is

31-66
40
80

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > O2- > F- > Na+
Na+ > O2- > N3- > F-
O2- > F- > Na+ > N3-
N3- > Na+ > O2- > F-

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Chemistry
The chief source of naphthalene is

Camphor
Diesel
Coal-tar
Charcoal

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Chemistry
The third shell of an atom can have a maximum of ______ electrons

18
21
15
13

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MORE MCQ ON Chemistry

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