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Chemistry

Chemistry
Pollutant from motor car exhaust that causes mental disease is

NO2
Lead
Hg
SO2

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Chemistry
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

1/4
1/6
1/8
1/3

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Chemistry
Which of the following could be used as fuel in propellant or rockets ?

Liquid Hydrogen + Liquid Oxygen
Liquid Nitrogen + Liquid Oxygen
Liquid Hydrogen + Liquid Nitrogen
Liquid Oxygen + Liquid Argon

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Chemistry
"Paramagnetism" is the property of

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

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Chemistry
The degree of dissociation of an electrolyte depends on

Dilution
Method of dissolution
Impurities
Atmospheric pressure

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Fluorescence
Raman spectra
Absorption spectra
Emission spectra

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