Question # 1

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

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

During chromatography strip should be dipped into solvent mixture to a depth of.

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3-4 mm

4-5 mm

5-6 mm

6-7 mm

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

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

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

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

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

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

In chromatographic technique. Rf has unit.

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Mol dm-3

Cm

m3

No units

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

Drying agent used in crystallization is.

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P2O3

Animal charcoal

KMnO4

Water

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

Gooch crucible is made of.

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Glass

Paper

Teflon

Procelain

Which of the following precautions in necessary for smooth filtration

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The filter paper should be of big size

The tip of funnel should not touch the side of the beaker

The stem of the funnel should be very small

The stem of he funnel should remain continuously full of liquid

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