Tag: basic analytical techniques

Questions Related to basic analytical techniques

Which of the following is the seperation technique to seperate mercury and water?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Seperating funnel

  2. Sublimation

  3. Filteration followed by evaporation

  4. Seperating funnel followed by evaporation or distillation

Show answer
Correct Option: A
Explanation:

We can separate them using separating funnel because the two are immiscible and mercury is denser than water.

When a mixture of common salt and ammonium chloride is heated, white fumes are liberated which change into a white deposit when cooked. What is this substance?

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. Ammonium chloride

  2. Common salt (sodium chloride)

  3. A mixture of ammonium chloride and common salt

  4. Ammonium sulphate

Show answer
Correct Option: A
Explanation:

When a mixture of common salt and ammonium chloride is heated, white fumes are liberated which changes into a white deposit when cooked. This white substance is ammonium chloride. Salt and Ammonium chloride are separated by the method of sublimation.

Mixute of ammonium chloride and sodium chloride can be seperated by :

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. distillation

  2. chromatography

  3. sublimation

  4. all of the above

Show answer
Correct Option: C
Explanation:

Substances like camphor, ammonium chloride, naphthalene, benzoic acid, iodine sublime on heating.
$\underset{(Impure)}{Solid}    \xrightarrow{\Delta}     vapour     \xrightarrow{cool}    \underset{Sublimate}{solid(pure)}$

A mixture of barium sulphate and $H _2O$ can be separated by the method of filtration.

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A mixture of barium sulphate and $H _2O$ can be separated by the method of filtration. Barium sulphate is insoluble in water.  During filtration, barium sulphate remains on the filter paper and water passes as through filter paper as filtrate.

A vendor sells white powdered salt-mixed with white powdered stone. The knowledge of which property will help you detect this malpractice?

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. Ductility

  2. Opacity

  3. Density

  4. Solubility

Show answer
Correct Option: D
Explanation:

The purity of the solid salt sample can be anaylsed simply by checking its solubility in proper solvent,

choose a proper solvent and add a pinch of compound to it, if the compound is completely soluble that means compound is pure.

What is meant by sublimation?

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. Conversion of solid into liquid on heating

  2. Conversion of solid into gas on heating

  3. Conversion of liquid into gas on heating

  4. Change of shape of solid on heating

Show answer
Correct Option: B
Explanation:

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Sublimation is easier for volatile materials which can be evaporated at low temperatures.


Hence, the correct option is $B$

Sublimation is used to separate :

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. two liquids having different boiling points

  2. two liquids having same melting point

  3. volatile and non volatile solids

  4. volatile solids having same melting point

Show answer
Correct Option: C
Explanation:

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.

Which of the following shows sublimation on heating?

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. Solids

  2. Liquids

  3. Gases

  4. All of these

Show answer
Correct Option: A
Explanation:

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. 

Which of the following mixtures cannot be separated by sublimation?

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. Salt and ammonium chloride

  2. Salt and naphthalene

  3. Salt and camphor

  4. Camphor and naphthalene

Show answer
Correct Option: D
Explanation:

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Ammonium chloride, camphor, anthracene, napthalene can sublime but common salt cannot sublime. Hence, option D is correct.

The change of solid into vapours on heating and of vapours into solid on cooling is called :

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. sublimation

  2. condensation

  3. distillation

  4. all of above

Show answer
Correct Option: A
Explanation:

There are many substances which are converted into gas from solid when heated, and converted from gas to solid when cooled without converting into liquid. Such substances are known as sublime and the proce3wss is called sublimation.