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Class 12 Mcq

Class 12 Chemistry के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ChemistryFor a dilute solution containing a non-volatile solute, the relative lowering of vapour pressure is approximately equal to what?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryA liquid has high vapour pressure. Which statement about its intermolecular attraction is correct?Class 12Chapter 01: Solutions4: Vapour PressureLevel 2Easy ChemistryHow is the total vapour pressure of an ideal solution containing two volatile components obtained?Class 12Chapter 01: Solutions4: Vapour PressureLevel 3Easy ChemistryWhy does the vapour pressure of a solution become lower than that of the pure solvent when a non-volatile solute is added?Class 12Chapter 01: Solutions4: Vapour PressureLevel 3Easy ChemistryThe vapour pressure of a pure solvent is 80 kilopascal and the mole fraction of solvent in the solution is 0.75. What is the partial vapour pressure of the solvent?Class 12Chapter 01: Solutions4: Vapour PressureLevel 3Easy ChemistryIf the mole fraction of the solvent decreases, what happens to its partial vapour pressure according to Raoult’s law?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryWhat is the safest first step while solving vapour-pressure questions based on Raoult’s law?Class 12Chapter 01: Solutions4: Vapour PressureLevel 5Medium ChemistryWhich option gives the correct relation between vapour pressure and boiling point?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryA solution has lower vapour pressure than pure solvent. What may this indicate?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryWhen the vapour pressure of a liquid is low, what can be said about its tendency to form vapour?Class 12Chapter 01: Solutions4: Vapour PressureLevel 3Easy ChemistryIf XA increases and XB decreases, what happens to PA and PB in an ideal binary solution?Class 12Chapter 01: Solutions4: Vapour PressureLevel 5Medium ChemistryIf X_A = 0.5, P_A° = 100 units, X_B = 0.5, and P_B° = 200 units, what is the total vapour pressure?Class 12Chapter 01: Solutions4: Vapour PressureLevel 6Medium ChemistryIn which case will lowering of vapour pressure be maximum?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryIf actual vapour pressure is lower than expected, what does it indicate about particle behaviour?Class 12Chapter 01: Solutions4: Vapour PressureLevel 5Medium ChemistryWhat is most useful to identify first in a vapour-pressure question?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryWhen is the effect of the amount of liquid considered negligible for vapour-pressure comparison?Class 12Chapter 01: Solutions4: Vapour PressureLevel 5Medium ChemistryIf external pressure is increased, what change is needed to boil the liquid?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryIf a liquid has low vapour pressure, what can be predicted about its boiling point?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryWhy does salt water boil at a higher temperature than pure water?Class 12Chapter 01: Solutions4: Vapour PressureLevel 4Easy ChemistryEqual mole amounts of two non-volatile solutes are dissolved separately in water and no dissociation occurs. How will lowering of vapour pressure compare?Class 12Chapter 01: Solutions4: Vapour PressureLevel 5Medium