Here is a worksheet for Class 12 Chemistry based on the updated NCERT syllabus for the 2023-24 academic year. The questions are categorized into Part 1 (Physical & Inorganic Chemistry) and Part 2 (Organic Chemistry)
Class 12 Chemistry Worksheet
Part 1: Physical & Inorganic Chemistry
1. (Solutions)
A solution of glucose in water has a molality of 0.5 mol/kg. Calculate the mole fraction of glucose if the density of the solution is 1.2 g/mL.
2. (Electrochemistry)
A zinc rod is dipped in 0.1 M solution of ZnSO4. The salt is 95% dissociated at this dilution at 298 K. Calculate the electrode potential.
[ E°Zn2+ /Zn = – 0.76 V]
3. (Chemical Kinetics)
The rate constant of a reaction at 500 K is . If the activation energy is 120 kJ/mol, calculate the rate constant at 600 K using the Arrhenius equation.
4. (The d-Block Elements)
Why do the transition metals exhibit variable oxidation states? Give two examples with chemical equations.
5. (Coordination Compounds)
For the complex [Fe(en)2Cl2], Cl, (en = ethylene diamine), identify
(i) the oxidation number of iron,
(ii) the hybrid orbitals and the shape of the complex,
(iii) the magnetic behaviour of the complex,
(iv) the number of geometrical isomers,
(v) whether there is an optical isomer also, and
(vi) name of the complex. (At. no. of Fe = 26)
Part 2: Organic Chemistry
6. (Haloalkanes and Haloarenes)
Explain why chlorobenzene is less reactive towards nucleophilic substitution reactions compared to chloroethane.
7. (Alcohols, Phenols, and Ethers)
Write the reaction for the preparation of phenol from benzene using the Dow process.
8. (Aldehydes, Ketones, and Carboxylic Acids)
An organic compound with molecular formula reacts with -DNPH to give an orange precipitate. It gives a silver mirror with Tollen's reagent. Identify and write its reactions with the given reagents.
9. (a) Give chemical tests to distinguish between
(i) Propanal and Propanone, (ii) Benzaldehyde and Acetophenone.
(b) How would you obtain
(i) But-2-enal from Ethanal, (ii) Butanoic acid from Butanol,
(iii) Benzoic acid from Ethylbenzene?
10. (Amines)
Distinguish between primary, secondary, and tertiary amines using the Hinsberg test. Write the chemical reactions involved.