Question # 1

Chromatography in which stationary phase is a solid is called.

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Partition chromatography

Paper chromatography

High pressure liquid chromatography

Adsorption chromatography

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

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

One of the following substances is not used as a drying reagent in a desiccator

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Cons. H₂SO₄

P₂O₅

Silica gel

50% KOH

"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 in which the stationary phase is a solid is classified as.

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Partition chromatography

Gas chromatography

Adsorption Chromatography

Thin layer chromatography

The crystallization of a solid substance is done from a hot saturated solution. The solution is

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Evaporated rapidly

Cooled very slowly to get good crystals

Cooled rapidly to get excellent crystals

Mixed with another miscible solvent

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

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

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

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Non-volatile or thermally unstable

Volatile or thermally unstable

Non-volatile or thermally stable

Volatile or unstable

When i₂present in the aquous layer in the form of I^-1₃foes to CCI₄layer, then the change in colour is from

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Purple to brown

Purple to green

Green to brown

Brown to purple

Drying agent used in crystallization is.

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P2O3

Animal charcoal

KMnO4

Water

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

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

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Retardation factor

Chromatogram

Base line

Solvent front

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

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The size of paper used

Their Rt values solutes

Temp of the experiment

Size the chromate grapic tank

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

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

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