Tag: chemistry

Questions Related to chemistry

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

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.

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

Show answer
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

Show answer
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

Show answer
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. ${\text{HN}}{{\text{O}} _{\text{3}}}$

Show answer
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

Show answer
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.

Name a technique used to separate : Petrol and water

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. distillation

  2. separating funnel

  3. sublimation

  4. chromatography

Show answer
Correct Option: B
Explanation:

Use a separating funnel since the petrol floats above the water.Just let the mixture stand. Petrol and water are not soluble, so they will eventually separate. Since the petrol is lighter than the water, it will form a layer on top, and may be drawn off.Petrol will form at the top of water as it is not as heavy. 

Filtration as a method of separation can be used for mixtures that are :

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. homogeneous and liquid-in-gas mixtures

  2. heterogeneous and liquid-in liquid mixtures

  3. hogeneous and solid-in-liquid mixtures.

  4. heterogeneous and solid-in liquid mixtures

Show answer
Correct Option: D
Explanation:

Filtration is generally used for heterogeneous solution or solution which are partially miscible or immisscible, or in solid liquids phase.