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Chemistry

Chemistry
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

O3
CO
All of these
CO2

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Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Magnesium
Iron
Oxygen
Silicon

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Chemistry
Rectified spirit is :

95% ethyl alcohol
Methylated spirit
Tincture iodine
100% ethyl alcohol

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Chemistry
The heaviest naturally occurring element is:

Polonium
Uranium
Thorium
Mercury

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Chemistry
Galena is a mineral of

Calcium
Lead
Gold
Iron

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Chemistry
White phosphorus is generally kept under

Water
Alcohol
Kerosene oil
Glycerine

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