Surface Chemistry Test 6

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:Chemisorption

Answers Choices:

Involves the weak attractive interactions between adsorbent and adsorbate

Is irreversible in nature

Decreases with increase of temperature

Involves multilayer formation of adsorbent on adsorbate

Questions 2 of 50

Question:Chemisorption

Answers Choices:

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

Answers Choices:

The extent of adsorption depends on the nature of the adsorbent and adsorbate

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

Answers Choices:

k

log k

n

1/n

Questions 5 of 50

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

Answers Choices:

Adsorption on solids is reversible

Adsorption increases with increase in temperature

Adsorption is spontaneous

Both enthalpy and entropy of adsorption are negative

Questions 6 of 50

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

Answers Choices:

\(\Delta H\) is of the order of 400 kJ

Adsorption is irreversible

Adsorption may be multimolecular layer

Adsorption is specific

Questions 7 of 50

Question:A catalyst is used

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

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

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

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

Questions 14 of 50

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

Answers Choices:

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

Answers Choices:

Mass

Physical state

Physical state and chemical composition

Mass and chemical composition

Questions 16 of 50

Question:Wilhem Ostwald redefined the action of

Answers Choices:

Anamers

Isomers

Catalyst

Geometry of monomers

Questions 17 of 50

Question:In a reversible reaction, a catalyst used

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

\({K_2}Cr{O_4}\)

\(KBr\)

\({K_2}S{O_4}\)

Questions 21 of 50

Question:Smoke is an example of

Answers Choices:

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

Answers Choices:

Gelatin

Egg albumin

Gum arabic

Starch

Questions 23 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

\(PO_4^{ - 3}\)

\(SO_4^{ - 2}\)

\(N{a^ + }\)

\(A{l^{3 + }}\)

Questions 26 of 50

Question:Which one of the following is a hydrophobic sol

Answers Choices:

Starch solution

Gum solution

Protein solution

Arsenic sulphide solution

Questions 27 of 50

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

Answers Choices:

\(P{b^{ + 2}}\)

\(P{b^{ + 4}}\)

\(S{r^{ + 2}}\)

\(N{a^ + }\)

Questions 28 of 50

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

Answers Choices:

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

Answers Choices:

Reflection of light

Refraction of light

Polarisation of light

Scattering of light

Questions 30 of 50

Question:The emulsifying agent in milk is

Answers Choices:

Lactic acid

Casein

Lactose

Fat

Questions 31 of 50

Question:Butter is

Answers Choices:

A gel

An emulsion

A sol

Not a colloid

Questions 32 of 50

Question:An emulsion is a colloidal dispersion of

Answers Choices:

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

Answers Choices:

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

Answers Choices:

Butter

Milk

Cream

Face cream

Questions 35 of 50

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

Answers Choices:

Suspensions

Emulsions

Sugar solution

Gold sol

Questions 36 of 50

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

Answers Choices:

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

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

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

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

Questions 37 of 50

Question:Size of colloidal particle is

Answers Choices:

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

Answers Choices:

Magnesium nitrate

Potassium nitrate

Potassium sulphate

Aluminium nitrate

Questions 39 of 50

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

Answers Choices:

Peptization

Coagulation

Hydrolysis

Precipitation

Questions 40 of 50

Question:Tyndall effect is more pronounced in

Answers Choices:

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

Answers Choices:

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

Answers Choices:

Dispersion

Exchange of solvent

Peptization

None of these

Questions 43 of 50

Question:An example of an associated colloid is

Answers Choices:

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

Answers Choices:

Cataphoresis

Tyndall effect

Brownian movement

None of these

Questions 45 of 50

Question:Which of the following is not an emulsion

Answers Choices:

Butter

Ice cream

Milk

Cloud

Questions 46 of 50

Question:Colloidal solution of gold cannot be prepared by

Answers Choices:

Bredig's arc method

Mechanical dispersion

Reduction of gold chloride

Exchange of solvents

Questions 47 of 50

Question:Toilet soap is a mixture of

Answers Choices:

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

Answers Choices:

\(CaC{l_2}\)

\(NaCl\)

\(AlC{l_3}\)

\(N{a_2}S{O_4}\)

Questions 49 of 50

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

Answers Choices:

\({H_2}O\)

\({C_6}{H_6}\)

\(C{H_3}OH\)

\({C_2}{H_5}OH\)

Questions 50 of 50

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

Answers Choices:

Urea

Dodecyl trimethyl ammonium chloride

Pyridinium chloride

Glucose