CBSE 12TH CHEMISTRY - Online Test
Q1. In the button cells widely used in watches and other devices the following reaction takes place:
Determine E^ofor the reaction.
Determine E^ofor the reaction.
Answer : Option D
Explaination / Solution:
Q2. Necessary conditions for any system to be aromatic:
Answer : Option D
Explaination / Solution:
Aromaticity condition involves huckel rule (4n+2) Pie electrons. And proper delocalization of pie electron.
Q3.
The reactionobeys the rate equationwhat would be the order of this reaction?
Answer : Option B
Explaination / Solution:
Order of reaction with respect to a is x and wrt to b is y so total order of reaction is x+y.
Q4. Adsorption is a
Answer : Option A
Explaination / Solution:
Adsorption is entirely a bulk phenomenon while absorption is bulk phenomenon.
Q5. The biological polymer is
Answer : Option A
Explaination / Solution:
Nucleic acid is biological polymers.
Q6. An organic compound X is oxidised by using acidified K2Cr2O7. The product obtained reacts with Phenyl hydrazine but does not answer silver mirror test. The possible structure of X is
Answer : Option C
Explaination / Solution:
Secondary alcohol on oxidation forms ketone which reacts with hydrazine bus doesnot gives silver mirror test.
Q7. Greater the value of KH, lower will be the
Answer : Option C
Explaination / Solution:
Pgas= KH× Xgas.Xgas
is measure of solubility of gas.
is measure of solubility of gas.
Q8. Which of the following amines can be resolved into enantiomers?
Answer : Option D
Explaination / Solution:
2-pentamine will have a chiral center.
Q9. Which of the following is prepared by cyanamide process?
Answer : Option D
Explaination / Solution:
Q10. In the froth floatation process for the concentration of ore, the particles float because
Answer : Option B
Explaination / Solution:
In froth floatation ore particles get wetted with oil and comes to the surface with froath.
