Read and download free pdf of CBSE Class 12 Chemistry Solutions Assignment. Get printable school Assignments for Class 12 Chemistry. Standard 12 students should practise questions and answers given here for Chemistry in Grade 12 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 12 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations
2.1 What are solns?
Homogeneous mixture containing two or more than two components.
2.2 What are binary solns?
Binary solution : Solutions containing only two components.
2.3.Define mole fraction
Ratio of number of moles of a component to the total number of moles of solutions.
2.4 Define molarity
Number of moles of solute dissolved in one litre of solution.
2.5 Define molality
Number of moles of the solute dissolved in 1 kg of the solvent.
2.6. State Henry’s law
The partial pressure of the gas in vapour phase is directly proportional to the molefraction of the gas in the solution. P = KH x
2.7. Mention one application of Henry’s law
To increase the solubility of CO2 in soft drinks , the bottle is sealed under high pressure.
2.8. State Raoutlt’s Law
For a solution of volatile liquids, the partial vapour pressure of each component in the solution is directly proportional to its mole fraction. P1 = p0 1 x1
2.9. What are Ideal solutions?
Solutions which obey Raoult’s law . solute –solvent interaction is nearly equal to solute –solute or solvent – solvent interaction. Δmix H = 0 and Δmix V = 0 Eg: n- hexane and n-heptane
2.10. What are non-ideal solutions?
Solutions which do not obey Raoult’s law . Inter molecular force of attraction between solute – solvent is Weaker or stronger than those between solute –solute or solvent – solvent interaction. Δmix H ≠ 0 Δmix ↑ ≠ 0
Positive deviation: Solutions which do not obey Raoult’s law. Inter molecular force of attraction
between solute –solvent is Weaker than those between solute –solute or solvent – solvent interaction. Molecule find it easier to escape than in pure state. This will increase the vapour pressure and results positive deviation. Δmix H = + ive Δmix V = + ive eg. Mixtureof ethanol and water.
Click for more Chemistry Study Material ›