Tag: basic analytical techniques

Quizzes (4) Questions (82)

Questions Related to basic analytical techniques

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

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

  1. Seperating funnel

  2. Sublimation

  3. Filteration followed by evaporation

  4. Seperating funnel followed by evaporation or distillation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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?

  1. Ammonium chloride

  2. Common salt (sodium chloride)

  3. A mixture of ammonium chloride and common salt

  4. Ammonium sulphate
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. distillation

  2. chromatography

  3. sublimation

  4. all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Ductility

  2. Opacity

  3. Density

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

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

What is meant by sublimation?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $B$

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

Sublimation is used to separate :

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

Which of the following mixtures cannot be separated by sublimation?

  1. Salt and ammonium chloride

  2. Salt and naphthalene

  3. Salt and camphor

  4. Camphor and naphthalene
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. sublimation

  2. condensation

  3. distillation

  4. all of above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.