# Surface Chemistry Test 6

Total Questions:50 Total Time: 75 Min

Remaining:

## Questions 1 of 50

Question:Chemisorption

Is irreversible in nature

Decreases with increase of temperature

## Questions 2 of 50

Question:Chemisorption

Increases with temperature

Decreases with temperature

Remains unaffected by change of temperature

Either increases or decreases with temperature

## Questions 3 of 50

Question:Which one of the following statement is not correct

The extent of adsorption depends on the pressure of the gas

The extent of adsorption depends on the temperature

The extent of adsorption has no upper limit

## Questions 4 of 50

Question:For the adsorption of a gas on a solid, the plot of log (x/m) versus log P is linear with slope equal to

k

log k

n

1/n

## Questions 5 of 50

Question:Which one of the following characteristics is not correct for physical adsorption

Adsorption increases with increase in temperature

Both enthalpy and entropy of adsorption are negative

## Questions 6 of 50

Question:Which of the following is not a characteristic of chemisorption

$$\Delta H$$ is of the order of 400 kJ

## Questions 7 of 50

Question:A catalyst is used

Only for increasing the velocity of the reaction

For altering the velocity of the reaction

Only for decreasing the velocity of the reaction

All , 1,2,3 and are correct

## Questions 8 of 50

Question:A catalyst is a substance which

Alters the equilibrium in a reaction

Is always in the same phase as the reactants

Participates in the reaction and provides easier pathway for the same

Does not participate in the reaction but speeds it up

## Questions 9 of 50

Question:When a catalyst is added to a system the

Value of equilibrium constant is decreased

The rate of forward reaction is increased and that of backward reaction is decreased

Equilibrium concentrations are unchanged

Equilibrium concentrations are increased

## Questions 10 of 50

Question:A catalyst can affect reversible reaction by

Changing equilibrium

Slowing forward reaction

Attaining equilibrium in both direction

None of these

## Questions 11 of 50

Question:Regarding criteria of catalysis which one of the following statements is not true

The catalyst is unchanged chemically at the end of the reaction

A small quantity of catalyst is often sufficient to bring about a considerable amount of reaction

In a reversible reaction the catalyst alters the equilibrium position

The catalyst accelerates the reaction

## Questions 12 of 50

Question:Which of the following reaction is catalysed by enzyme maltase

Starch $$\to$$ maltose

Maltose $$\to$$ glucose

Lactose $$\to$$ maltose

Maltose $$\to$$ glucose + fructose

## Questions 13 of 50

Question:The components of Zigler Natta catalyst, used in the polymerisation of propylene, are

$$TiC{l_3} + Al{({C_2}{H_5})_3}$$

$$TiC{l_4} + Al{({C_2}{H_5})_3}$$

$$Ti{({C_2}{H_5})_3} + AlC{l_3}$$

$$Ti{({C_2}{H_5})_4} + AlC{l_3}$$

## Questions 14 of 50

Question:Which of the following statements regarding catalyst is not true

A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst can initiate a reaction

A catalyst does not alter the equilibrium in a reversible reaction

Catalyst are sometimes very specific in respect of reaction

## Questions 15 of 50

Question:A catalyst remains unchanged at the end of the reaction regarding

Mass

Physical state

Physical state and chemical composition

Mass and chemical composition

## Questions 16 of 50

Question:Wilhem Ostwald redefined the action of

Anamers

Isomers

Catalyst

Geometry of monomers

## Questions 17 of 50

Question:In a reversible reaction, a catalyst used

Increases the speed of the forward reaction

Decreases the speed of the backward reaction

Does not alter the final state of equilibrium

Increases the amount of the products formed

## Questions 18 of 50

Question:Which one is an example of gel

Soap

Cheese

Milk

Fog

## Questions 19 of 50

Question:The random or zig-zag motion of the colloidal particles in the dispersion medium is referred to as

Electro-osmosis

Electrophoresis

Brownian movement

Tyndall effect

## Questions 20 of 50

Question:Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol

$${K_4}[Fe{(CN)_6}]$$

$${K_2}Cr{O_4}$$

$$KBr$$

$${K_2}S{O_4}$$

## Questions 21 of 50

Question:Smoke is an example of

Gas dispersed in liquid

Gas dispersed in solid

Solid dispersed in gas

Solid dispersed in solid

## Questions 22 of 50

Question:Gold number is minimum in case of

Gelatin

Egg albumin

Gum arabic

Starch

## Questions 23 of 50

Question:Movement of colloidal particles under the influence of electrostatic field is

Electrophoresis

Electrolysis

Dialysis

Ionisation

## Questions 24 of 50

Question:When a freshly precipitated substance is converted into a colloidal solution with the help of a third substance, the process is known as

Coagulation

Peptization

Electrodispersion

Dialysis

## Questions 25 of 50

Question:Which of the following will have highest coagulating power for $$A{s_2}{S_3}$$ colloid

$$PO_4^{ - 3}$$

$$SO_4^{ - 2}$$

$$N{a^ + }$$

$$A{l^{3 + }}$$

## Questions 26 of 50

Question:Which one of the following is a hydrophobic sol

Starch solution

Gum solution

Protein solution

Arsenic sulphide solution

## Questions 27 of 50

Question:Which of the following has minimum value of flocculating power

$$P{b^{ + 2}}$$

$$P{b^{ + 4}}$$

$$S{r^{ + 2}}$$

$$N{a^ + }$$

## Questions 28 of 50

Question:According to Graham, colloids are those substances which are

Insoluble in water

In solution do not pass through filter paper

Of definite size of particles

Separated from crystalloids by parchment paper

## Questions 29 of 50

Question:The reason for exhibiting Tyndall effect by the colloidal particle is

Reflection of light

Refraction of light

Polarisation of light

Scattering of light

## Questions 30 of 50

Question:The emulsifying agent in milk is

Lactic acid

Casein

Lactose

Fat

## Questions 31 of 50

Question:Butter is

A gel

An emulsion

A sol

Not a colloid

## Questions 32 of 50

Question:An emulsion is a colloidal dispersion of

A liquid in a gas

A liquid in a liquid

A solid in a liquid

A gas in a solid

## Questions 33 of 50

Question:Gelatin is mixed in ice-cream

As a coagulant

For taste

For colour

As a protective colloid

## Questions 34 of 50

Question:Which of the following is an example of `water in oil' type emulsion

Butter

Milk

Cream

Face cream

## Questions 35 of 50

Question:In which of the following Tyndall effect is not observed

Suspensions

Emulsions

Sugar solution

Gold sol

## Questions 36 of 50

Question:The coagulation power of an electrolyte for arsenious sulphide decreases in the order

$$N{a^ + },\,A{l^{ + 3}},\,B{a^{ + 2}}$$

$$PO_4^{ - 3},\,SO_4^{ - 2},\,C{l^ - }$$

$$A{l^{ + 3}},\,B{a^{ + 2}},\,N{a^ + }$$

$$C{l^ - },\,SO_4^{ - 2},\,PO_4^{ - 3}$$

## Questions 37 of 50

Question:Size of colloidal particle is

1 nm

1 – 100 nm

> 100 nm

> 1000 nm

## Questions 38 of 50

Question:The concentration of electrolyte required to coagulate a given amount of $$A{s_2}{S_3}$$ sol is minimum in the case of

Magnesium nitrate

Potassium nitrate

Potassium sulphate

Aluminium nitrate

## Questions 39 of 50

Question:"Delta" at the rivers are formed due to

Peptization

Coagulation

Hydrolysis

Precipitation

## Questions 40 of 50

Question:Tyndall effect is more pronounced in

Hydrophilic sols

Hydrophobic sols

Starch solution

Both 1 and 2

## Questions 41 of 50

Question:A coagulating agent frequently added to water to remove the suspended and colloidal impurities is

Mohr salt

Alum

Bleaching powder

Copper sulphate

## Questions 42 of 50

Question:$$Fe{(OH)_3}$$ when treated with $$FeC{l_3}$$ solution a reddish-brown solution is formed. The process involved is

Dispersion

Exchange of solvent

Peptization

None of these

## Questions 43 of 50

Question:An example of an associated colloid is

Milk

Soap solution

Rubber latex

Vegetable oil

## Questions 44 of 50

Question:The movement of colloidal particles towards the oppositely charged electrodes on passing electricity is known as

Cataphoresis

Tyndall effect

Brownian movement

None of these

## Questions 45 of 50

Question:Which of the following is not an emulsion

Butter

Ice cream

Milk

Cloud

## Questions 46 of 50

Question:Colloidal solution of gold cannot be prepared by

Bredig's arc method

Mechanical dispersion

Reduction of gold chloride

Exchange of solvents

## Questions 47 of 50

Question:Toilet soap is a mixture of

Calcium and sodium salts of fatty acids

Fatty acids and glycerol

Sodium salts of fatty acids

Potassium salt of fatty acids

## Questions 48 of 50

Question:Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is minimum in the case of

$$CaC{l_2}$$

$$NaCl$$

$$AlC{l_3}$$

$$N{a_2}S{O_4}$$

## Questions 49 of 50

Question:The surface tension of which of the following liquid is maximum ?

$${H_2}O$$

$${C_6}{H_6}$$

$$C{H_3}OH$$

$${C_2}{H_5}OH$$

## Questions 50 of 50

Question:Which one of the following forms micelles in aqueous solution above certain concentration ?