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Published on: 24/05/2021
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Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
Take MCQ Chemistry Test
1.
Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon __________________.
Temperature
Nature of solute
Pressure
Nature of solvent
2.
A beaker contains a solution of substance 'A'. Precipitation of substance 'A' takes place when small amount of 'A' is added to the solution. The solution is ................ .
saturated
supersaturated
unsaturated
concentrated
3.
At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is ................... .
less than the rate of crystalisation
greater than the rate of crystallisation
equal to the rate of crystalisation
zero
4.
On dissolving sugar in water at room temperature, solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid ?
Sugar crystals in cold water
Sugar crystals in hot water
Powdered sugar in cold water
Powdered sugar in hot water
5.
Which of the following units is useful in relating concentration of solution with its vapour pressure ?
mole fraction
parts per million
mass percentage
molality
1.
(c)
Pressure
2.
(b)
supersaturated
3.
At equilibrium, rate of dissolution = rate of crystallisation.
4.
As solution is cool to touch, dissolution is endothermic. Hence, high temperature will favour dissolution. Further, powered sugar has large surface area and will dissolve faster.
5.
\(\frac { { p }^{ o }-{ p }_{ s } }{ { p }^{ o } } ={ x }_{ 2 }\) (mole fraction of solute in solution) - Raoult's law.
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