CBSE 12TH CHEMISTRY - Online Test
Q1. If a reaction proceeds with a uniform rate throughout, the reaction is
Answer : Option B
Explaination / Solution:
Rate of reaction is independent of concentration of reactant.
Q2. Which among the following is an example of homogenous catalyst?
Answer : Option A
Explaination / Solution:
Homogeneous catalysis is one in which catalyst and reactants are both in same phase.
Q3. Hydrolysis of protein into peptone is brought about by.
Answer : Option C
Explaination / Solution:
Pepsin enzyme leads hydrolysis of proteins.
Q4. Arrange the following compounds in increasing order of their acid strength: Propan – 1 – ol, 2,4,6 – trinitrophenol, 3 – nitrophenol, 3,5 – dinitrophenol,phenol, 4 – methylphenol.
Answer : Option D
Explaination / Solution:
Phenols are more acidic than alcohols Also in phenols if –M groups like –NO2 are arranged then acidity increases. And –M operates only at o/p position. At m only –I operates.
Q5. Mathematical expression relating molarity and molality is
Answer : Option A
Explaination / Solution:
m= moles of solute / mass of solvent. M= moles of solute / volume of solution.
Q6. The following compound is called
Answer : Option D
Explaination / Solution:
This is pyrrole, a heterocyclic compound.
Q7. Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with hydrogen peroxide to form another compound. The colour of the compound is
Answer : Option C
Explaination / Solution:
Q8. Ionization enthalpy is lowest in
Answer : Option B
Explaination / Solution:
Metals have low ionization energy because of there tendency to lose electrons.
Q9. Cinnabar is an ore of
Answer : Option B
Explaination / Solution:
HgS is cinnabar.
Q10. Which of the following monomers form biodegradable polymers?
Answer : Option D
Explaination / Solution:
Glycine + amino caproic acid= nylon 2-nylon 6 3 – hydroxybutanoic acid + 3 – hydroxypentanoic acid = PHBV They are biodegradable.
