CBSE 12TH CHEMISTRY - Online Test
Q1. Nylon – 2 – Nylon – 6 is
Answer : Option B
Explaination / Solution:
Nylon -2-nylon-6 is polyamide copolymer.
Q2. Nitrous oxide is evolved when Zn is treated with
Answer : Option D
Explaination / Solution:
Q3. Which of the following cation does not form an ammine complex with excess of ammonia?
Answer : Option B
Explaination / Solution:
Na+ is s block element so doesnot form ammine complex.
Q4. Which sequence of steps below describes the best synthesis of 5 – oxohexanoic acid starting with 1 – methylcyclopentan – 1 – ol
Answer : Option B
Explaination / Solution:
5 – oxohexanoic acid starting with 1 – methylcyclopentan – 1 – ol can be synthesized using conc H2SO4 which will cause dehydration forming alkene which with KMnO4 opens the ring and forms 1 – methylcyclopentan – 1 – ol.
Q5. Effluents of washing may cause pollution, if
Answer : Option D
Explaination / Solution:
If highly branched detergents molecules are present then it may cause pollution.
Q6. An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
Answer : Option C
Explaination / Solution:
Equivalent conductance increases on dilution for a strong electrolyte because of increase in mobility of ions.
Q7. Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
Answer : Option D
Explaination / Solution:
Neopentane has all same type of hydrogen and has molecular weight 72u
Q8. The half life of a reaction is halved as the initial concentration of the reactant is doubled. The order of the reaction is
Answer : Option B
Explaination / Solution:
For second order reaction half life is inversely related to concentration of reactant.
Q9. Enzymes are
Answer : Option B
Explaination / Solution:
Enzymes are biological catalyst, they catalize different chemical reactions in body.
Q10. An example of antibody is
Answer : Option B
Explaination / Solution:
Antibody gamma globulin
