Tag: separation of matter

Quizzes (5) Questions (142)

Questions Related to separation of matter

Multiple choice chemistry separation of matter filtration and crystallisation other methods of separation separation techniques

Crystallisation is better than simple evaporation because :

  1. some impurities may remain in the solution after filtration

  2. some solids decompose or heating

  3. both A and B

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Some solids decompose or some, like sugar, may get charred on heating to dryness. Some impurities may remain dissolved in the solution even after filtration. On evaporation these contaminate the solid. So, crystallisation is better than evaporation.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

If the constituents of a solid-liquid mixture have different masses, then we can separate them using:

  1. sublimation

  2. centrifugation

  3. winnowing

  4. evaporation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Centrifugation is a technique which involves the application of centrifugal force to separate particles from a solution. The larger the size and the larger the density of the particles, the faster they separate from the mixture. Example- washing machine works on the principle of centrifugation.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Which of the following can be used for Solid-Solid mixture separation?

  1. Mechanical separation

  2. Magnetic separation

  3. Gravity separation

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solid-solid mixtures can be separated using various physical methods depending on the properties of the components, such as mechanical picking, magnetic properties, or density differences (gravity).

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Water is said to be permanently hard when it contains:

  1. chloride and sulphates of Mg and Ca

  2. bicarbonate of Na and K

  3. carbonate of Na and K

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Permanent hardness in water is caused by the presence of dissolved chlorides and sulfates of calcium and magnesium, which cannot be removed by boiling.