Experimental Techniques In Chemistry Set 1

Results

#1. Solvent extraction is an equilibrium process and it is controlled by

law of mass action

the amount of solvent used

distribution law

the amount of solute

#2. The comparative rates at which the solutes move in paper chromatography depend on

the size of paper used

Rf values of solutes

temperature of the experiment

size of the chromatographic tank used

#3. A filtration process could be very time consuming if it were not aided by the gentle suction, which is developed

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

#4. Solvent extraction method is particularly useful technique for separation, when product to be separated is

non–volatile or thermally unstable

volatile or thermally stable

non volatile or thermally stable

non–volatile or thermally unstable

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

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 pure crystals of the product

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

#6. Aqueous solution of iodine is prepared first by dissolving which compound in water

KBr

KCl

NaCl

#7. The meaning of chromatos

colour writing

colour grading

colour forming

colour spreading

#8. Which is not common way of carrying chromatography

ascending

descending

radial/circular

spreading irregularly

#9. In paper chromatography the stationary phase is

water

organic liquid

inorganic liquid

none of the above

#10. In paper chromatography the mobile phase is

organic liquid

water

inorganic liquid

none of the above

Finish