Multiple Choice QuestionsThe 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
Alums are used for
tanning of leather
coagulation of blood
purification of water
all of the above
C.
purification of water
Potash alum is used for tanning of leather, as mordant in dyeing and and calico printing, for sizing paper, as a syptic to stop bleeding and purification of water.
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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