Question # 1

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

Solvent extraction method is particularly useful technique for separation when the product to be speared is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

"The components of which mixture can be separated by filtration".

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NaCl and CaCl2

Calcium carbonate and NaCl

Blue and green inks

Sand and naphthalene

Chromatography involves the distribution of a solute between.

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Two stationary phases

Two mobile phases

A stationary phase and a mobile phase

Two stationary and two mobile phase.

Which one of the following substances is not sublime material.

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Iodine

Benzoic acid

Ammonium chloride

Potash alum

The components of which mixture can be separated by sublimation.

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NaCl and Ca cl2

Is and water

Sand and Naphthalene

Blue and red inks

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

In solvent extraction, solute can be separated from solution, by shaking the solution with solvent in which the solute is.

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More soluble

Partially soluble

Insoluble

soluble at high temp

A filtration process could by very time consuming if it were into aided by a gentle suction which is developed.

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If the paper covers the funnel upto 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

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

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

Solvent extraction method is a particularly useful technique for separation when the product to be separated is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

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

The comparative rates at which the solutes move in paper chromatography depend on.

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The size of paper used

Rf values of solutes

Temperature of the experiment

Size of the chromatographic tank used

The iodine present in water can be separated by which one of the following techniques

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Sublimation

Chromatography

Filtration

Solvent extraction

Which one of the following substances is not used as drying agent in desiccators.

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Calcium chloride

Phosphorus pentoxide

Silica gel

50% NaCl

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

Drying agent used in crystallization is.

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P2O3

Animal charcoal

KMnO4

Water

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