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Chemistry

Chemistry
Which of the following contains high content of lead?

High octane fuel
Cooking gas
Coal
Low octane fuel

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Chemistry
Which one of the following minerals is found in Monazite sand ?

Potassium
Sodium
Thorium
Uranium

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Chemistry
Liquid Nitrogen boils at

82 Kelvin
97 Kelvin
77 kelvin
54 kelvin

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Chemistry
Which of the following laser types is used in a laser printer?

Gas laser
Dye laser
Excimer laser
Semiconductor laser

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Chemistry
Which of the following methods is used in determining the number average molar mass of a macromolecule

Light scattering
Osmotic pressure
Sedimentation equilibrium
Viscosity

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Chemistry
Nitrogen forms a variety of compounds in all oxidation states ranging from

–3 to + 3
–3 to + 4
–3 to + 5
–3 to + 6

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