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Chemistry

Chemistry
Main source of lead pollution is from

Insecticides
Tobacco
Leaded gasoline
Sewage

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Chemistry
The number of electrons presents in H+ is

three
two
zero
one

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Chemistry
A balloon filled with helium rises in air because

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

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Chemistry
Which of the following elements is non-radioactive ?

Zirconium
Uranium
Thorium
Plutonium

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Chemistry
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Copper at cathode and oxygen at anode
Copper at cathode and anodes dissolve to give copper
Copper at anode and oxygen at cathode.
Hydrogen at cathode and oxygen at anode

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Chemistry
Colloids can be purified by

Dialysis
Condensation
Condensation
Condensation

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MORE MCQ ON Chemistry

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