CBSE 12TH CHEMISTRY - Online Test
Q1. Polythene is not one of the following
Answer : Option B
Explaination / Solution:
Polymer is not semi synthetic. It is synthetic.
Q2. The maximum covalency of nitrogen is
Answer : Option C
Explaination / Solution:
N has maximum covalency of 4 since only four (one s and three p) orbitals are available for bonding. d orbitals are not available for bonding.
Q3. The impurities associated with ore is known as
Answer : Option C
Explaination / Solution:
Gangue are the unwanted particles present with ores.
Q4. Which among the following elements does not belong to first transition series?
Answer : Option B
Explaination / Solution:
Ag belongs to second transition series.
Q5. The following compound is called
Answer : Option A
Explaination / Solution:
This is 4 – nitrobenzenecarbaldehyde and 4 – nitrobenzaldehyde
Q6. The coordination number of Cr in [Cr(NH3)3(H2O)3]Cl3 is
Answer : Option D
Explaination / Solution:
Coordination number of the central ion is equal to no. of coordination bonds formed with surrounding ions.
Q7. The narrow spectrum antibiotic is
Answer : Option C
Explaination / Solution:
Penicillin G is narrow spectrum antibiotic.
Q8. Standard electrode potential are measured with the concentrations of all the species involved in a half-cell is
Answer : Option A
Explaination / Solution:
Under standard condition concentration of every species is taken as 1.
Q9. Yield of the following compound is high
Answer : Option D
Explaination / Solution:
This reaction is free radical reaction and 3o free radical is most stable.
Q10. Choose the appropriate answer(s) for the below representation from the options given
Answer : Option D
Explaination / Solution:
They are, enatiomers as 1 is R, other is S. Therefore are stereo isomers. And dextro and levo.
