Question # 1

Which one of the following substances is used as decolouring agent

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Animal charcol

Concentrated H₂SO₄

CaCI₂

Silica gel

The drying agent used in a desiccator.

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Agcl

NH4Cl

P2O5

AlCl3

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

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

In order to have good crystals of a substance the temperature of the system at the time of preparation of solution should be

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Around 0°C

Around room temperature

Sufficiently more than room temperature

Just above the room temperature

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

During paper chromatography, the stationary phase is.

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Solid

Liquid

Gas

Plasma

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

Chromatography is the process which involve the distribution of a solute between

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Two mobile phases

A stationary phase and mobile phase

Two stationary and two mobile phases

Two stationary phases

"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

The comparative rates at which the solutes move in paper chromatography, depends on

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The size of paper used

Their R_fvalues

Their partition coefficients

The polarity of solvent used

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 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

Gooch crucible is made of.

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Glass

Paper

Teflon

Procelain

The substance used for decolorization of crystalline substance is

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G2O5

Chloroform

Animal charcoal

Soda ash

Which substance is nto a dehydrating agent.

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CaCl3

CdCl2

Silica gel

P2O5

Chromatographic technique is very useful for

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Isolation

Purification

separation

All of them

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