Tag: basic analytical techniques

Questions Related to basic analytical techniques

Which of the following solvents is used for separation of mixture of sand and sulphur?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Water

  2. Benzene

  3. Carbon di sulphide

  4. Ethyl alcohol

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Correct Option: C
Explanation:

The separation is carried out by using organic solvent carbon disulphide in which sulfur is soluble. Sand is insoluble and can be filtered out. The remaining solution is exposed to atmosphere from which carbon disulphide will gradually evaporate and sulfur is recovered back from the solution.

How is scrap-iron separated from other wastes in a scrap yard?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Sublimation

  2. Magnetic separation

  3. Handpicking

  4. Winnowing

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Correct Option: B
Explanation:

Waste materials supplied to factories contain a number of scrap metals including iron ore. so, in factories, scrap iron is separated from the heap of waste materials by using big electromagnets fitted to a crane. 

Winnowing is used to seperate:

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. homogenous solid-solidmixtures

  2. homogenous solid-liquid mixtrures

  3. heterogenous solid-liquid mixtures

  4. heterogenous solid-solid mixtures

Show answer
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.

Sand and water are separated by the method of:

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. sieving

  2. sublimation

  3. magnetic separation

  4. decantation

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Correct Option: D
Explanation:

As sand does not mix water. sand settles down like precipitates. so you can decant it from water. and water can be filtrated to get more clean water.

Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension.

In a separating funnel, organic phase is always _______ aqueous phase.

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Above

  2. Below

  3. Mixed together

  4. Both a and b

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Correct Option: A
Explanation:

A separatory funnel, also known as separation funnel, is a piece of laboratory glassware used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities. Most organic solvents float on top of an aqueous phase, though important exceptions are most halogenated solvents

X and Y are liquids with unequal densities. Which method can be employed to separate them?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Centrifugation

  2. Chromatography

  3. Distillation

  4. Separating funnel

Show answer
Correct Option: D
Explanation:

Separating funnel is an effective method where two liquids that do not dissolve very well in each other (immiscible liquids) can be separated by taking advantage of their unequal density. 

What seperation technique will you use for seperating:


(a) Oil from water
(b) Tea leaves from tea
(c) Wheat grains from husk

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. a = filtration, b = Winnowing, c = Separating funnel

  2. a = Winnowing, b = filtration, c = Separating funnel

  3. a = Separating funnel, b = filtration, c = Winnowing

  4. a = Separating funnel, b = Winnowing, c = filtration

Show answer
Correct Option: C

A student accidentally poured a blue liquid into a beaker of water in the laboratory. The blue liquid is immiscible in water and is denser than water. What must he use to separate the 2 liquids?

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. Filter Funnel

  2. Displacement Can

  3. Separating Funnel

  4. Distilling Flask

Show answer
Correct Option: C
Explanation:

In separating funnel two liquids are separated depending upon their relative density. The liquid which is denser settles down below which can be separated and the liquid having lower density settled above.

We can separate alcohol dissolved in water by using a separating funnel.

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. True

  2. False

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Correct Option: B
Explanation:

As water and alcohol are miscible so we can not separate them using separating funnel and distillation is used to separate them.

A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be:

chemistry basic analytical techniques partition coefficients solvent extraction separation methods

  1. chloroform

  2. water

  3. mixture of both

  4. none of these

Show answer
Correct Option: B
Explanation:

As density of water is less than chloroform so upper layer will be of water while lower layer contains chloroform.