CBSE 12TH CHEMISTRY - Online Test
Q1. Buna – N is a polymer which is stretchable because of one of the following. Choose the most appropriate.
Answer : Option B
Explaination / Solution:
Buna N is polymer which is stretchable due to weakest intermolecular forces.
Q2. Ammonia act as a Lewis base because nitrogen has
Q3. Which technique utilizes the density difference between the ore and the impurity to concentrate the ore is
Answer : Option B
Explaination / Solution:
Levigation is process of grinding an insoluble substance to a fine powder while wet. The material is introduced into mill together with water. It is based on the density difference between ore and impurity.
Q4. Electronic configuration of Mn2+ is
Answer : Option D
Explaination / Solution:
Mn has atomic number 25.
Q5. Aldehydes are produced on reduction of the following by DIBAL – H
Answer : Option C
Explaination / Solution:
Both Nitriles and esters are reduced to Aldehyde on reaction with DIBAL-H.
Q6. Liquid dishwashing agents are
Answer : Option A
Explaination / Solution:
Liquid dishwashing agents are non ionic detergents.
Q7. In which of the following compounds the oxidation state of the nickel atom is 0?
Answer : Option A
Explaination / Solution:
CO is neutral ligand so Ni has 0 oxidation state.
Q8. Difference between ionic (electrolytic) and electronic conductivity is that electronic conductance takes place in metals by ________ conductance takes place in solutions by ions
Answer : Option A
Explaination / Solution:
Electrolytic conductivity is due to the movement of ions and electronic conductivity is due to the movement of electrons.
Q9. Finkelstein reaction is
Answer : Option C
Explaination / Solution:
Halide exchange reaction is Finkelstein reaction in which alkyl chloride is converted to alkyl iodide.
Q10. Straight line graph for first order reaction is obtained between
Answer : Option B
Explaination / Solution:
Ln[R]=ln[Ro]−kt
