UP Board Class 12 Solutions — practice questions
27 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice UP Board Class 12 Solutions in the app →Henry's law for the solubility of a gas in a liquid is best stated as:Why are deep-sea divers given a breathing mixture of helium and oxygen instead of ordinary air?The mole fraction of urea ($M = 60\,\text{g/mol}$) in an aqueous solution containing $6\,\text{g}$ of urea in For an ideal solution containing two volatile liquids A and B, Raoult's law gives the total vapour pressure asFor a dilute solution of a non-volatile solute B in a solvent A, the relative lowering of vapour pressure equaThe elevation in boiling point of a solution is given by $\Delta T_b = K_b m$. The molal elevation constant $KThe freezing point of water is depressed when a non-volatile solute is added because:Osmotic pressure of a dilute solution is expressed by van't Hoff's equation as:Two solutions are said to be **isotonic** if they:If $\mathrm{NaCl}$ undergoes complete dissociation in water, the van't Hoff factor $i$ is:Benzoic acid associates in benzene to form dimers. The van't Hoff factor $i$ for benzoic acid in benzene (assuDesalination of sea water is best carried out by:A solution of glucose in water has a freezing point depression of $0.186\,\text{K}$. Given $K_f$ for water $= A solution showing positive deviation from Raoult's law has:The solubility of a gas in a liquid generally:A $0.5$ molal aqueous solution of a non-electrolyte ($K_b = 0.52$ K kg/mol for water) boils at:A solution of $0.1$ M sucrose at $300$ K has osmotic pressure (using $R = 0.0821$ L atm/(mol K)):The van't Hoff factor $i$ for $0.1$ m NaCl (assuming complete dissociation) is:The MOLARITY of a solution containing 58.5 g NaCl dissolved in 1 L of solution is:The KEY DIFFERENCE between molarity (M) and molality (m) is that:HENRY'S LAW states that at constant temperature:A MINIMUM-BOILING azeotrope arises from:Which of these is NOT a colligative property?Salt is sprinkled on icy roads in cold countries to:The OSMOTIC PRESSURE π of a dilute solution is given by:The van't Hoff factor (i) for sodium chloride (NaCl) in water is approximately:Raoult's law for an ideal solution of two volatile components states: