Question # 1

Which one of the following is not property of a good solvent.

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It should be inexpensive

It should dissolve impurities easily

It should dissolve large amount of solute at boiling point and less amount of solute at low temperature.

It should not react chemically with solute

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

Several types of filter media are used for filtration depending on

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Natural of reactants

Nature of reaction

Size of precipitate

Nature of filter paper

Which one of the following substances is used as decolouring agent

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Animal charcol

Concentrated H₂SO₄

CaCI₂

Silica gel

Which statement about Gooch crucible is incorrect.

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It is made up of porcelain

Quick filtration occur by using suction filtering apparatus

All the chemicals which reacts with paper can be filtered.

Filter medium used in this crucible consists many folds of filter paper only.

A filtration process could be very time consuming if it were not aided by a gentle suction, which is developed

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If the paper covers the funnel up to its circumference

If the paper has got small sized pores in it

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

In paper chromatograghy the point at which the solvent rises to maximum extent is called

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Event

Chromatogram

Solvent front

Base line

Which one is not example of a sublimate.

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NH4Cl

I

NaCl

Benzoic Acid

If fluted fitter paper, rate of filtration increases as compared tot he cone shaped filter paper because.

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It has greater number of holes in it.

It has greater surface are of filtration

Fluted filter paper has greater pore sizes than cone shaped filter paper.

Thickness of paper is more than cone shaped filter paper

Solvent extraction is an equilibrium process and is controlled by.

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Law of mass action

The mount of solvent used

The amount of solute

Distribution law

Which of the following substances is used as decolorizing agent.

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Silica gel

Animal charcoal

conc. H2SO4

Asbestos

To achieve a good separation, the two liquids are gently shaken to increase their area of.

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Miscibility

Separation

contact

Solubility

Solvent extraction is an equilibrium process and it is controlled by

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Law of mass action

The amount of solvent used

Distribution law

The amount of solute

During the process of crystallization, the hot saturated solution;

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Is cooled very slowly to get large-sized crystals

Is cooled at a moderated rate to get medium-sized crystals

Is evaporated to get the crystals of the product

Is mixed with an immiscible liquid to get the pure crystals of the produce

Which one of the following substances is not sublime material.

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Iodine

Benzoic acid

Ammonium chloride

Potash alum

A component having small value of K mostly remains in the.

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Stationary phase

Mobile phase

Chromatographic tank

Solvent

Which one of the following methods will be used to separate the mixture of NaCl and sand.

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Chromatography

Solvent extraction

Sublimation

Filtration

Chromatographic technique is very useful for

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Isolation

Purification

separation

All of them

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