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Chemistry

Chemistry
The ore which is found in abundance in India is

magnetite
fluorspar
bauxite
monazite

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Chemistry
"Paramagnetism" is the property of

Unpaired electrons
Completely vacant electronic subshells
Completely filled electronics subshells
Paired electrons

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Chemistry
Which one of the following is used for dating very old objects of archaeological importance?

Phosphorus-31
Tritium
Carbon-14
Radium

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Chemistry
Ozone depletion in the stratosphere is mainly caused by

NO
NO2
SO2
Chlorogluorocarbons

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Chemistry
The common refrigerant in domestic refrigerator is

Nitrogen
Freon
Oxygen
Neon

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Chemistry
Who first published the periodic table

John Dalton
Dmitri Mendeleev
Henry Moseley
Julius Lothar Meyer

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