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Chemistry

Chemistry
Which one of the following elements exhibits the greatest tendency to lose electrons ?

Zinc
Fluorine
Oxygen
Lithium

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Chemistry
Which metal does not undergo corrosion due to the formation of oxide layer?

Iron
Aluminium
Copper
Zinc

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Chemistry
The number of electrons presents in H+ is

three
zero
one
two

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Chemistry
The chief source of naphthalene is

Charcoal
Diesel
Coal-tar
Camphor

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Chemistry
The number of waves in n x 10th Bohr's orbit are

n-2
n3
n
n2

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Chemistry
Which substance is used to retard the setting action of cement?

Al2O3
CaSO4, 2H2O
CaO
Na2O + K2O

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