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Chemistry
Periodic Classification of Elements
CBSE
Class 10
Chemistry
Class 10 - Chemistry
Periodic Classification of Elements
MCQ
Test #
3
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1.
Mendeleev placed the noble gases in a separate group because
a.
they are having low concentration in atmosphere
b.
they are having high concentration in atmosphere
c.
they are chemically unreactive
d.
they are chemically reactive
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