Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1401.

Which of the following statements is incorrect ?A. On prolonged dialysis, solloid becomes stableB. `AnNO_(3)` is excess KI froms negative colloidC. `AgNO_(3)` in excess KI from postive colloidD. Medicines work in colloidal from because of grater surface area.

Answer» Correct Answer - C
It is an incorrect statement. Mixing `AgNO_(3)` with excess of Kl froms negative colloid.
Discussion
1402.

Dispersed phase and dispersion medium of gel are respectivelyA. Solid, liquidB. Liquid, solidC. Liquid, gasD. Gas, liquid

Answer» Correct Answer - B
Discussion
1403.

What is the dispersed phase and dispersion medium in gel?

Answer» Correct Answer - Dispersed phase is liquid and dispersion medium is solid.
Discussion
1404.

The dispersed phase and dispersion medium in soap lather are respectively :A. gas and liquidB. liquid and gas.C. solid and gasD. solid and liquid

Answer» Correct Answer - A
Soap lather is formed due to bubbles of air present in liquid soap solution.
Discussion
1405.

Chalk stick dipped in an ink solution exhibits the surface of the stick retains the colour of the ink. Explain the observations.

Answer» Chalk stick dipped in an ink solution, the surface of the stick retains the colour of the ink due to adsorption of coloured molecules in the ink.
Discussion
1406.

Chalk stick dipped in an ink solution exhibits the Breaking the chalk stick, it is found still white from inside. Explain the observations.

Answer» Chalk stick dipped in an ink solution, the surface of the stick retains the colour of the ink due to adsorption of coloured molecules in the ink while the solvent of the in k goes deep into the stick due to absorption so on breaking the chalk stick, it is found to be white inside.
Discussion
1407.

Match the type of packing given in column I with the iterms given in column II.

Answer» Correct Answer - (a)-(ii), (b)-(iii), (c ) -(iv); (d)-(i)
Discussion
1408.

Which of the following process will be observed, when a chalk stick is dipped in the solution of ink?A. adsorption of coloured substanceB. adsorption of solventC. absorption and adsorption both of solventD. absorption of solvent.

Answer» Correct Answer - A::D
Both these phenomenon occur.
Discussion
1409.

Petro-crops are plantsA. PlatinumB. ASM-5C. IronD. Nickel

Answer» Correct Answer - B
ZSM-5 acts as a shape selective catalyst.
Discussion
1410.

According to Freundlich adsorption isotherm, which of the following is correct?A. `x//mpropp^(1)`B. `x//mpropp^(1//n)`C. `x//mpropp^(o)`D. All are correct for different ranges of pressure.

Answer» Correct Answer - D
According to Freundlich adsorption isotherm, `x//m=kp^(1//n)`
1/n can have values between 0 to 1 over different ranges of pressure.
Discussion
1411.

Which one of the following does NOT involve coagulation:-A. Formation of delta regionsB. peptizationC. Treatment of drinking water by potash alumD. Clotting of blood by the use of ferric chloride

Answer» Correct Answer - B
The dispersion of a freshly precipitated material into colloidal solution by the action of an electrolyte solution is termed peptization. It involves the adsorption of suitable ions and the electrically charged particles then splits from the precipitate as colloidal particles.
Discussion
1412.

According to the adsorption theory of catalysis the speed of the reaction increases becauseA. the heat liberated during adsorption increases the rate of reactionB. the kinetic energy of reactants increases which increases the rate of reactionC. the activation energy of reaction increases which increase the rate of reactionD. The concentration of reactants at the active centres becomes high due to adsorption resulting in increase in the rate of reaction.

Answer» Correct Answer - D
Discussion
1413.

Which is the incorrect statementA. Emulsions of oil in water are unstableB. Emulsifying agent stavilises an emulsionC. For stabilisation of W/O emulsion soap is usedD. The droplets in emulsions can be precipitated by electrolytes

Answer» Correct Answer - C
Discussion
1414.

Which of the following forms a hydroxide highly soluble in water?A. NaCl solutionB. GlucoseC. StarchD. Barium nitrate

Answer» Correct Answer - C
Discussion
1415.

Components of milk may be obtained byA. HeatingB. FreezingC. CentrifugingD. Both (1) & (3)

Answer» Correct Answer - D
Discussion
1416.

Which enzyme converts milk into curd?

Answer» Correct Answer - Lacto bacilli.
Discussion
1417.

Which of the following method is not employed for the purification of colloids?A. DialysisB. UltrafiltrationC. WavelengthD. Brownian movement

Answer» Correct Answer - C
Discussion
1418.

The random motion of colloidal particles in the dispersion medium is known asA. Electro-osmosisB. electrophoresisC. Browninan movementD. Tyndall effect

Answer» Correct Answer - C
Discussion
1419.

Milk isA. Dispersel fats in oilB. Dispersed fats in waterC. Dispersed water in fatsD. Dispersed water in oil

Answer» Correct Answer - B
Discussion
1420.

_________ are granular structures first observed under electron microscope as dense particles by _______ (1955).A. Light scattered by colloidal particlesB. Size of colloidal particlesC. Shpa oe colloidal particlesD. Relative size of the colloidal particles

Answer» Correct Answer - A
Discussion
1421.

Particles of ________ are certainly visible under a microscopeA. true solutionB. colloidal systemC. suspensionD. all of these

Answer» Correct Answer - C
A true solution contains small solute particles molecules or ions dispersed throughout solvent the particles are invisible even under a microscope a suspensino contains very much larger insoludle particles which may be visible to naked eye and certainly visible under a microscope.
colloidal systems lie between the two extremes of a true solution and asspension and contain particles of intermediate ion and a suspension and contain particles of intermediate size these may consist of agglomerates of small partics ort of single particles such as large molecules of rubber plastics cellulose or proteins colloidal particles may be seen with the help of an ultra microscope.
Discussion