Multiple Choice QuestionsWhich gas is evolved by the treatment of magnesium with very dilute solution of HNO3?
N2
NO2
H2
H2O
The high boiling point of water is due to which reason:
co-ordinate bonding
covalent bond
electrostatic force of attraction
hydrogen bonding
The ortho and para hydrogen differ in respect of which of the following ?
In the molecular weight
In the nature of spin of protons
In the nature of spin of electrons
In the number of protons
B.
In the nature of spin of protons
The ortho and para hydrogen differ in the nature of spin of protons. In ortho hydrogen, the spin of proton are in the same direction, while in para hydrogen the spin of proton are in opposite direction.
Alums are used for
tanning of leather
coagulation of blood
purification of water
all of the above
The method used to remove temporary hardness of water is :
Clark's method
Ion-exchange method
Synthetic resins method
Calgon's method
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