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CHEMISTRY

Chemistry
Element 106 was discovered by

Seaborg
Rutherford
Kurchatove
Lawrence

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Chemistry
The gas used for filling weather balloons is

Hydrogen
Helium
Air
Nitrogen

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Chemistry
The most abundant element is

Oxygen
Silicon
Nitrogen
Calcium

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Chemistry
A balloon filled with helium rises in air because

Helium pushes down on the air below the balloon
Helium is less dense than air
Air exerts an upward force on the balloon
The balloon is weightless

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Chemistry
Which one of the following is also known as solution ?

A homogeneous mixture
A compound
A suspension
A heterogeneous mixture

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