CBSE Questions for Class 6 Chemistry Separation Of Substances Quiz 3 - MCQExams.com

A concentrated solution contains a higher amount of solute than a dilute solution.
  • True
  • False
What is C?
  • Salt solution
  • Unsaturated
  • Saturated
  • Super saturated solution
Suspended impurities can not be removed by :
  • sedimentation
  • addition of chemicals
  • filtration
  • electromagnetic method
Which of the following processes can be useful in separating the salt from a mixture of sand and salt?
  • Sublimation
  • Filtration
  • Evaporation
  • All of the above
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Which of the following methods is most suitable for obtaining a pure, dry sample of sodium chloride from a mixture of solid sodium chloride and sand?
  • Shake the mixture with water, filter and dry the residue on the filter paper.
  • Shake the mixture with water, filter and evaporate the filtrate.
  • Heat the mixture gently and collect the substance which sublimes
  • Heat the mixture gently and collect the substance which boils off
During the process of filtration, the solid particles remain on filter paper, these solid particles are called_____.
  • solution
  • sediment
  • filtrate
  • residue
A solvent (water) contain both soluble and insoluble impurities. How will you separate them?
  • By filtration followed by evaporation
  • By sedimentation followed by precipitation
  • By crystallisation
  • By fractional distillation
The different processes used to separate sand, sawdust, and salt from the mixture dissolved in water are respectively:
  • sedimentation, filtration and evaporation
  • filtration, evaporation and condensation
  • decantation and evaporation
  • hand picking and evaporation
In which of the following mixtures hand picking method can be best used?
  • The mixture of gas and liquid.
  • The mixture of liquid and liquid.
  • The mixture of solid and liquid.
  • The mixture of solid and solid.
The essential condition for winnowing activity is:
  • water
  • wind
  • electricity
  • machines
Which method is used to separate lighter particles like fodder from grains?
  • Hand picking
  • Sieving
  • Winnowing
  • Sedimentation
Settling down of heavy particles of a solid substance in liquid while keeping it for some time is known as:
  • filtration
  • sedimentation
  • decantation
  • sublimation
Methods of separating sunstances from their mixtures are:
  • hand picking and winnowing
  • sieving and sedimentation
  • decantation and filtration
  • all of them
How can husk particles be separated from pulses?
  • By hand picking
  • By winnowing
  • By churning
  • By hydraulic washing
Saturated solution of $$NaCl$$ on heating becomes:
  • supersaturated
  • unsaturated
  • remains saturated
  • None of these
The mixture of sand and iron can be separated from each other by using a magnet.
  • True
  • False
Sieving is the method used to separate the particles of:
  • same size
  • different size
  • same color
  • different colour
What are the advantages of handpicking methods?
  • The materials which are very small can be removed by handpicking method.
  • The materials which can not removed by machines, can be easily removed by handpicking.
  • This method take less time for less quantity of substance.
  • All of these
An electrolyte dissolves in water if:
  • lattice energy is less than hydration energy
  • lattice energy is greater than hydration energy
  • lattice energy is equal to hydration energy
  • dissolution is endothermic
Winnowing is the process used to separate particles of ____________.
  • heavier and lighter weight
  • only two heavier particles
  • only two lighter paticles
  • None of the above
Combine harvesters are used to
  • Harvest
  • Thresh
  • Winnow
  • All the above
Which of the following aqueous solution is more concentrated?

(Assume that the density of the solution is $$1g/ml$$)
  • $$1M$$ Glucose
  • $$1m$$ Glucose
  • $$0.5m$$ Glucose
  • $$0.5M$$ Glucose
Salt is separated from seawater by 
  • evaporation
  • sublimation
  • filtration
  • All of these
Which one is sublimable substance?
  • Table salt
  • Sugar
  • Iodine
  • Potassium Iodide
What happens when a saturated solution is cooled?
  • It becomes unsaturated
  • It remains unaffected
  • It becomes supersaturated
  • It becomes transparent
Common salt is separated from its solution in water by decantation.
  • True
  • False
A mixture of water and NaCl can be separated by:
  • sublimation
  • evaporation
  • decantation
  • filtration
Winnowing is a process to remove small stones from grains.
  • True
  • False
The methods of separating components of a given mixture are based on the:
  • physical properties.
  • colour of the components only.
  • state of the components.
  • none of these.
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