name the part of a lens through which a ray of light passes without suffering any deviation
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7
Answer:
Optical centre...is the answer....
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Write the chemical name and chemical formula of the salt used to remove permanent hardness of water.
Answer:
Sodium Carbonate decahydrate, Na2CO3.10H2O.
3. Which of the following is not observed in a homologous series? Give reason for your choice.
a) Change in chemical properties
b) Difference in -CH2 and 14u molecular mass
c) Gradation in physical properties
d) Same functional group
Answer:
(a) Change in chemical properties
It does not occur due to the presence of the same functional group.
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