ISC Class 12 Chemistry Important Questions

ISC Class 12 Chemistry is one of the most important subjects for students who took the science group in class 12. It helps them learn, in-depth, about the elements and the compounds that constitute the atoms and molecules. Students interested in taking up chemistry as the core subject for their graduation or those who wish to take up the medical or engineering profession should be extremely thorough in the subject. The experts at BYJU’S have come up with the ISC Class 12 Important Questions to help the students in their preparation for the ISC Class 12 Chemistry examination.

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The Important Questions of ISC Class 12 Chemistry are given below:

  1. Write the chemical equations to illustrate the following name reactions:
    1. Wolff-Kishner reduction.
    2. Aldol condensation.
    3. Cannizzaro reaction.
  2. Account for the following:
    1. CH3CHO is more reactive with HCN than CH3COCH3.
    2. Carboxylic acids are stronger acids than phenol.
  3. Give one chemical test each to distinguish between the following pairs of compounds:
    1. Benzaldehyde and Benzoic acid
    2. Propanal and Propanone
  4. Explain why:
    1. PCl5 exists, but NCl5 does not.
    2. Fluorine is a stronger oxidising agent than chlorine.
    3. Bond enthalpy of F2 is less than that of Cl2.
  5. Account for the following
    1. Interhalogens are more reactive than halogens.
    2. N2 is less reactive at room temperature.
    3. Reducing character increases from NH3 to BiH3.
  6. State Faraday’s first law of electrolysis. Calculate the charge required in terms of Faraday for the reduction of 1 mole of Cu2+ to Cu.
  7. Define the following terms:
    1. Limiting molar conductivity.
    2. Fuel cell.
  8. How is silver extracted from its ore? Explain the process with relevant equations.
  9. Arrange the following in increasing order of basic strength: Aniline, p – nitroaniline and p – toluidine.
  10. Explain why transition metals and their compounds act as a catalyst.
    1. Physisorption decreases with an increase in temperature. Give reason.
    2. Why does the addition of alum purify water?
    3. Brownian movement stabilizes colloidal solutions. How?
  11. A substance decomposes by following first-order kinetics. If 50% of the compound is decomposed in 120 minutes, how long will it take for 90% of the compound to decompose?
  12. How is phenol converted to benzoic acid? Explain with the help of balanced chemical equations.
  13. Write the mechanism of acid dehydration of ethanol to yield ethene.
  14. Explain the amphoteric behaviour of amino acids.
  15. Write the names of the monomers of the following polymers:
    1. Nylon-6
    2. Buna-N
  16. What will be the major product obtained when 2-bromobutane reacts with alcoholic potassium hydroxide? State the type of reaction involved in it.
  17. Differentiate between an antiseptic and a disinfectant.
  18. Name a biodegradable detergent.
  19. Write two differences between ‘order of reaction’ and ‘molecularity of reaction’.
  20. Write balanced chemical equations for the Carbylamine reaction and Diazotization reaction.


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