CBSE Class 12-science Answered

Dear Sanal,

Unit 1: Solid State (Marks approx: 4)

• Mostly problem based questions carrying 3 marks.
• Problem based on calculation of density of unit cell, packing in solids, packing efficiency, voids, number of atoms per unit cell in a cubic unit cell are important.
• Theory based questions from unit cell in two dimensional and three dimensional lattices, point defects.

 Unit 2: Solutions (Marks approx: 5)

• One of the important chapters in scoring point of view.
• Two to three marks problem based questions are important.
• Problems and theory questions based on colligative properties, van’t Hoff factor.
• Vapour pressure of liquid solutions and Raoult’s law, Osmotic pressure.

Unit 3: Electrochemistry (Marks approx: 5)

• Problem based questions are important.
• Problems based on topics Kohlrausch’s law, EMF of cell, standard electrode potential, Nernst equation, effect of electrolyte concentration and temperature on the EMF of a cell, relation between Gibb’s energy change and EMF of  a cell.

All the Best!!