CBSE 12TH CHEMISTRY - Online Test
Q1. Which one of the following combines with Fe2+ ion to form a brown complex?
Q2. Clemmensen reduction of a ketone is carried out in the presence of which of the following?
Answer : Option C
Explaination / Solution:
For Clemmenson we use Zn-Hg( conc HCl )
Q3. The tetrahedral complex, bis(benzoylacetonato)beryllium(II) will show
Answer : Option C
Explaination / Solution:
This complex is non superimposable mirror image.
Q4. Persons allergic to Penicillin can be given
Answer : Option D
Explaination / Solution:
Sulpha drugs is given to treat people who are allergic to pencillin.
Q5.
How much electricity is required in coulomb for the oxidation of 1 mol of FeO to ?
Answer : Option C
Explaination / Solution:
For converting FeO to 1mol of electrons are required.
Q6. Chloroform is in closed dark coloured bottles completely filled
Answer : Option D
Explaination / Solution:
In presence of light choloroform oxidizes to form phosgene , which is poisonous gas.
Q7. The rate constant of the reaction at temperature 200 K is 10 times less than the rate constant at 400 K. The activation energy of the reaction is
Answer : Option C
Explaination / Solution:
Q8. Hydrophilic colloids are stable due to
Answer : Option C
Explaination / Solution:
This makes the colloid stable.
Q9. Bees – wax is.
Answer : Option A
Explaination / Solution:
Bees wax is myricylpaimitate.
Q10. The process of converting alkyl halides into alcohols involves_____________.
Answer : Option D
Explaination / Solution:
Alkyl halides are converted into alcohols by substitution reaction. When alkyl halides are treated with aqueous KOH, alcohols are formed. This is a nucleophilic substitution reaction.
