Tag: basic analytical techniques

Questions Related to basic analytical techniques

While separating oil and water, which component forms the upper layer ?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Oil

  2. Water

  3. Both A and B

  4. Air

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Correct Option: A
Explanation:

Oil being lighter than water forms the upper layer and water forms the lower layer.

Winnowing is used only for:

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. homogeneous solid-solid mixtures

  2. homogeneous solid-liquid mixtures

  3. heterogeneous solid-liquid mixtures

  4. heterogeneous solid-solid mixtures

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Correct Option: D
Explanation:

In order to separate $2$ heterogenous solid,Solid mixture in which particles having different masses can be separated by winnowing.

Ex. Wind winnowing is an agricultural method developed by ancient cultures for separating grain from chaff.

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 partition coefficients solvent extraction separation methods

  1. Ductility

  2. Opacity

  3. Density

  4. Solubility

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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.

In a separating funnel, one phase is ______ and other phase is :              .

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Aqueous phase, organic phase

  2. Aqueous phase, inorganic phase

  3. Inorganic phase, organic phase

  4. None of above

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Correct Option: A
Explanation:

A separating funnel is used for the separation of components of a mixture between two immiscible liquid phases. One phase is the aqueous phase and the other phase is an organic solvent. This separation is based on the differences in the densities of the liquids. The liquid having more density forms the lower layer and the liquid having less density forms the upper layer.

We sprinkle water in a dirty room before sweeping because:

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. water makes sweeping easier

  2. water repels dust particles

  3. water coagulates the dust particles

  4. sprinkling water is fashionable

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Correct Option: C

A mixture of oil and water is separated by:

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Filtration

  2. Using separating funnel

  3. Sublimation

  4. Fractional distillation

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Correct Option: B
Explanation:

Mixture of oil and water forms a heterogenous mixture with oil settled on top of water due to density variation. This can be separated using a separting funnel.

Oil and water are miscible liquids.

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. True

  2. False

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Correct Option: B
Explanation:

The error in the given statement is miscible.

The correct statement is oil and water are immiscible liquids.

Mixture of ${\text{Al}}{\left( {{\text{OH}}} \right) _3}\,\,{\text{and}}\,\,{\text{Fe}}{\left( {{\text{OH}}} \right) _3}$ can be separated by

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. ${\text{HCl}}\,$

  2. ${\text{N}}{{\text{H}} _{\text{4}}}{\text{OH}}\,$

  3. ${\text{NaOH}}$

  4. ${\text{HN}}{{\text{O}} _{\text{3}}}$

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Correct Option: A

Separation of $CCl 4$ from $CS _2$ can be carried out by ______ method.

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. fractional distillation

  2. separating funnel 

  3. crystallization

  4. decantation

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Correct Option: B
Explanation:

Separation of $C{Cl} _{4}$ from $C{S} _{2}$ can be carried out by careful distillation in presence of inert gas stream thus can be carried out by separating funnel method.


Two immiscible liquids are separated by?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Separating funnel

  2. Fractional distillation

  3. Chromatography

  4. Sublimation

Show answer
Correct Option: A
Explanation:

Separating immiscible liquids is done simply using a separating funnel. The two liquids are put into the funnel and are left for a short time to settle out and form two layers. The tap of the funnel is opened and the bottom liquid is allowed to run. The two liquids are now separate.