Tag: basic analytical techniques

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Questions Related to basic analytical techniques

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest?

  1. sieving

  2. winnowing

  3. magnetic separation

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

Winnowing is a traditional method in water air current is blown to separate particles of light weight and heavier weight.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

To separate ammonium chloride from common salt, we use:

  1. filtration

  2. sedimentation

  3. sieving

  4. sublimation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Ammonium chloride separated from common salt by sublimation process.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

You can use decantation to separate:

  1. two miscible liquids

  2. two immiscible liquids

  3. two metals in an alloy

  4. solid-solid mixture
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension. Example sand from water can be separated by decantation.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture?

  1. Magnetic separation

  2. Crystallisation

  3. Handpicking

  4. Filtration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The method in which substances in a mixture can be separated by just picking them out with the help of hand from the mixture is known as handpicking method. It is one of the various methods which are carried out in dry conditions.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Greasy spots can be removed from clothes by:

  1. evaporation

  2. sublimation

  3. fractional distillation

  4. dissolving in a suitable solvent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Greasy spots can be removed from clothes by dissolving them in a suitable solvent. For example, aqueous ammonia is used in laundries as a solvent for removing grease and oil stains.


Hence, option D is correct.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Seperation of two immiscible liquids is based on :

  1. difference in the solubility of the two liquids

  2. difference in the densities of the two liquids

  3. difference in melting point of the two liquids

  4. difference in boiling point of the two liquids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Separation of two immiscible liquids is based on difference the densities of the two liquids. The method is used for separating two immiscible liquids, such as oil and water.