CBSE 12TH CHEMISTRY - Online Test
Q1. Aniline does not undergo one of the following
Answer : Option C
Explaination / Solution:
Because of lot of electron density on N of N H 2.
Q2. Refining of silver is done by
Answer : Option A
Explaination / Solution:
Ag is refined by Cupellation.
Q3. Xenondifluoride is
Answer : Option B
Explaination / Solution:
CN=0.5(V+M-C+A) For XeF_2 CN = 5 so shape will be linear and structure will be trigonal pyramidal.
Q4. In cubic close packing(ccp) arrangement, the pattern of the successive layers will be designated as
Answer : Option A
Explaination / Solution:
Ist layer and 4th layer are same.
Q5. Copolymerisation of 1, 3 – butadiene and acrylonitrile needs
Answer : Option A
Explaination / Solution:
Copolymerisation of 1,3-butadiene and acrylonitrile requirw peroxide catalyst.
Q6. A reduction in the atomic size with increase in atomic number is characteristic of the elements of
Answer : Option C
Explaination / Solution:
In f block elements with increase in atomic number atomic radii decreases smoothly.
Q7. What is used as the complexing agent in volumetric analysis of ions like [Mg2+ and Ca2+
Answer : Option B
Explaination / Solution:
EDTA is hexadentate ligand so it forms stable chelate complex with metal ions.
Q8.
Compound 'A' undergoes formation of cyanohydrins which on hydrolysis gives lactic acid (CH3 CHOHCOOH). Therefore, compound 'A' is
Answer : Option A
Explaination / Solution:
And on hydrolysis CN converts to COOH.
And on hydrolysis CN converts to COOH.
Q9. Chloroxylenol is added to Dettol due to its
Answer : Option A
Explaination / Solution:
It has antiseptic properties.
Q10. The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is
Answer : Option A
Explaination / Solution:
