Chemistry · Class 12 · Chapter 1
Solutions
10 lessons 90 min 2 simulations
This chapter is about homogeneous mixtures, mostly liquid ones: how their composition is stated, how much gas or solid a liquid can hold, and how a dissolved substance changes the vapour pressure of a liquid. From that single change come the four colligative properties, which count solute particles and so give molar masses, and the van't Hoff factor, which corrects them when solutes split into ions or pair up.
What the exam asks
NEET asks for conversions between concentration units, Henry's law numericals with mole fractions, Raoult's law for two volatile liquids including the vapour composition, which mixtures deviate positively or negatively, and colligative-property numericals with the van't Hoff factor. Marks go on using molarity where molality is needed, grams of solvent instead of kilograms, forgetting i for electrolytes, and reading a larger Henry's constant as a more soluble gas.
Lessons
10 lessons · 90 min
1Types of solutions and concentrationNCERT §1.1; §1.28 min2Solubility and Henry's lawNCERT §1.39 min3Vapour pressure and Raoult's lawNCERT §1.410 min 1 sim4Ideal and non-ideal solutionsNCERT §1.56 min5Relative lowering of vapour pressureNCERT §1.6; §1.6.17 min6Elevation of boiling pointNCERT §1.6.27 min7Depression of freezing pointNCERT §1.6.37 min8Osmosis and osmotic pressureNCERT §1.6.4; §1.6.512 min 1 sim9Abnormal molar masses and van't Hoff factorNCERT §1.78 min10Chapter reviewMust-know facts, traps and formulas16 min