CBSE 12TH CHEMISTRY - Online Test
Q1. At what temperature range do most of the metals become superconductors?
Answer : Option C
Explaination / Solution:
2K – 5K temperature metal behaves as superconductors.
Q2. In vulcanisarion of rubber,
Answer : Option D
Explaination / Solution:
In vulcanization of rubber sulphur crosslinking is introduced.
Q3. Vitamin B12 contains
Answer : Option C
Explaination / Solution:
Vitamin B12 containsCo3+
Q4. In Hell – Volhard Zelinsky reaction, halogen reacts with
Answer : Option B
Explaination / Solution:
Alpha Hydrogen containing carboxylic acids undergo HVZ reaction.
Q5. Which among the following will not show geometrical isomerism?
Answer : Option A
Explaination / Solution:
[Co(en)3]3+ all ligands are same its symmetrical so doesnot exists as geometrical isomers.
Q6. Aspirin is not administered for
Answer : Option A
Explaination / Solution:
For blood clotting aspirin is not taken.
Q7. Three electrolytic cells A,B,C containing solutions of ZnSO4, AgNO3 and CuSO4, respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell. How long did the current flow? What mass of copper and zinc were deposited?
Answer : Option C
Explaination / Solution:
And mass of Zn and Cu deposited will be in ratio of their equivalent mass.
And mass of Zn and Cu deposited will be in ratio of their equivalent mass.
Q8. Carbon tetra chloride has a dipole moment
Answer : Option B
Explaination / Solution:
CCl4 is symmetrical hence dipole moment is zeo.
Q9. For the first order reaction, half life is equal to
Answer : Option D
Explaination / Solution:
For 1st order reaction half life is independent of initial concentration of reactant.
Q10. Liquid – liquid solutions are known as
Answer : Option D
Explaination / Solution:
Dispersed phase and dispersion medium both are liquids.
