Questions
Which of the following can be separated by solvent extraction?
- Mixture of sulphur and sand
- Mixture of iron ore and sand
- Mixture of sand and chalk powder
- Mixture of KNO3 and NaCl
Which of the following pairs of the process involved and the change happened is correctly matched?
- Tearing of paper : Chemical change
- Melting of ice : Chemical change
- Curdling of milk : Physico-chemical change
- Rusting of iron : Physical change
Which of the following methods is used to separate grains from bundles of stalk?
- Handpicking
- Threshing
- Sieving
- Winnowing
Find the odd one out.
- Impurities
- Clear solution
- Filtrate
- Pure substances
During evaporation, water changes from
- liquid to solid
- gas to liquid
- liquid to gas
- solid to liquid
Which method is preferred to separate the components of the same size from a mixture?
- Handpicking
- Winnowing
- Sieving
- Threshing
Which of the following pairs are incorrect matched?
- Substances that make mixture → components
- Removal of salt from pulses → Sedimentation
- Separating stones from sand → Sieving
- Removal of butter from milk → Decantation
Which of the following solutes dissolves the fastest in water?
- Salt
- Sugar
- Baking powder
- Chalk powder
On the basis of which principle can a mixture of oil and water be separated?
- On the same principle as sedimentation and decantation
- On the same principle as condensation and evaporation
- On the same principle as filtration and sedimentation
- On the same principle as condensation and sedimentation
Ritu was boiling eggs and to facilitate the same, she covered the saucepan with a steel plate. Upon removing the plate, she found out that there were water droplets on the inner side of the plate. What phenomenon led to the formation of these droplets?
- Condensation
- Evaporation
- Filtration
- Decantation
Sieving is used for
- separating slightly larger sized impurities
- separating heavier and lighter components of a mixture
- separating the components of a mixture having different sizes
- removing tiny particles from liquids
Which component from a mixture of grains, sand, stone and sawdust can be blown away by the wind?
- Grains
- Stone
- Sawdust
- Sand
Impurities found in the muddy water of ponds are separated by
- sedimentation
- evaporation
- sedimentation and filtration
- distillation
Which of the following mixtures is/are heterogeneous?
- Mixture of alcohol and water
- Blood
- Sand
- All of the above
Which of the following statements is/are true?
a. In a mixture of sand and water, the heavier sand particles settle down at the bottom and the water can be separated by sedimentation and then filtration.
b. Filtration can be used to separate components of mixture of a gas and a liquid.
c. A saturated solution is the one in which no more solute can be dissolved.
- Only a
- Only b
- Only c
- Both a and c