Chemistry

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

1.Rf values of solutes.

2.size of the chromatographic tank used

3.size of paper used.

4.temperature of the experiment.

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2. Solvent extraction is an equilibrium process and it is controlled by.

1.the amount of solute.

2.the amount of solvent used

3.law of mass action

4.distribution law

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

1.volatile or thermally unstable.

2.volatile Or thermally stable.

3.non- volatile or thermally unstable.

4.non- volatile or thermally stable.

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4. A filtration process could be very time consuming if it were not aided by a gentle suction which is developed:

1.if the paper fits tightly

2.if the paper has got small sized pores in it,

3.if the stem of the funnel is large, so that it dips into the filtrate.

4.if the paper covers the funnel up to its circumference.

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5. During the process of crystallization, the hot saturated solution:

1.is evaporated to get the crystals of the product.

2.is cooled at a moderate rate to get medium sized crystals.

3.is mixed with an immiscible liquid to get the pure crystals of the product

4.is cooled very slowly to get large sized crystals.

Question 5 of 5

Test By Subject	Punjab
Test By Topics	11th Class Chemistry

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