Question # 1

Which one of the following substances is not sublime material.

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Iodine

Benzoic acid

Ammonium chloride

Potash alum

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

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

Safe and reliable method of drying crystals is through.

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Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

During paper chromatography, the stationary phase is.

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Solid

Liquid

Gas

Plasma

Large value of distribution coefficient K means.

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Component of solute dissolved large in mobile phase

Components of solute do not dissolve in mobile phase

Components of solute remains at original spot

All statements are correct

The paper at which separation of solute have been taken place is called.

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Retardation factor

Chromatogram

Base line

Solvent front

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 moderate 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 product.

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