CBSE 12TH CHEMISTRY - Online Test
Q1. Phenol is less acidic than ______________.
Answer : Option A
Explaination / Solution:
The nitro-group is an electron-withdrawing group. The presence of this group in the ortho or para position decreases the electron density in the OH bond. As a result, it is easier to lose a proton. Also, the o-nitrophenoxide or p-nitrophenoxide ion formed after the loss of protons is stabilized by resonance. Hence, ortho and para nitrophenols are stronger acids than phenol.
Q2. In which unit, the concentration of solution remains independent of temperature
Answer : Option C
Explaination / Solution:
It is independent of volume hence independent of Temperature.
Q3. The reaction of Benzene diazonium chloride with aniline yields
Answer : Option A
Explaination / Solution:
This is also N-N coupling.
Q4. The slag obtained during the extraction of copper from copper pyrites is composed of
Answer : Option D
Explaination / Solution:
FeO is present as impurity and SiO2 is flux added.
Q5. Laughing gas is
Q6. London forces are present in
Answer : Option B
Explaination / Solution:
London Forces are present in non polar molecular solids.
Q7. Rubber tree is found in
Answer : Option C
Explaination / Solution:
Rubber tree is found in India.
Q8. Ferrous sulphate on heating gives
Answer : Option B
Explaination / Solution:
FeSO4 on heating gives SO2 and SO3
Q9. Blue solution of CuSO4 becomes darker when treated with ammonia because
Answer : Option C
Explaination / Solution:
Ammonia forms stable complex with Cu2+
Q10. Narcotic drugs are used in medicinal doses because
Answer : Option C
Explaination / Solution:
Narcotic drugs are addictive.
