Q.1
The method usually employed for the precipitation of a colloidal solution is …[ AIMPT 2000]
  • a) dialysis
  • b) addition of electrolytes
  • c) diffusion through animal membrane
  • d) condensation
Q.2
Peptisation is a process of ...
  • a) precipitation of colloidal particles
  • b) purification of colloids
  • c) dispersing precipitate into colloidal particles in the electric filed
  • d) movement of colloidal particles in the electric filed
Q.3
If a beam of light is passed through true solution, then it is ..[ AIPMT 1995]
  • a) visible
  • b) scatter
  • c) not visible
  • d) none of the above
Q.4
The process which is catalysed by one of the products formed during the reaction is known as
  • a) acid catalysis
  • b) anti catalysis
  • c) negative catalysis
  • d) auto-catalysis
Q.5
If dispersion medium is water, the colloidal system is called ..
  • a) aquasol
  • b) aerosol
  • c) organosol
  • d) sol
Q.6
Gelatin protects
  • a) Gold Sol
  • b) As2S3
  • c) Fe(OH)3
  • d) All of these
Q.7
The false statement for hydrophilic sols is ...
  • a) surface tension is lower than that of dispersion medium
  • b) they do not require electrolytes for stability
  • c) viscosity is of the order of that of water
  • d) coagulation is reversible
Q.8
Assertion: The activity of catalyst is more or less specific Reason: A catalyst for one reaction is not necessary to catalyse the other reaction
  • a) Assertion and reason both are correct and Reason is correct explanation of Assertion
  • b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
  • c) Assertion is correct but Reasoning is wrong
  • d) Assertion is wrong but reason is correct
Q.9
Which act(s) as negative catalyst?
  • a) lead(lV) oxide in the decomposition of H2O2
  • b) Mn2+ in the oxidation of oxalic acid by acidified KMnO4
  • c) Lead tetraethyl as antiknock compound
  • d) MnO2 in the decomposition of KClO3
Q.10
Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l- sol ? [NEET 2019]
  • a) 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI
  • b) 50 mL of 1 M AgNO3 + 50 mL of 2 M KI
  • c) 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI
  • d) 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI
Q.11
On which of the following properties does the coagulating power of an ion depend ? [NEET 2018]
  • a) Both magnitude and sign of the charge on the ion
  • b) Size of the ion alone
  • c) The magnitude of the charge on the ion alone
  • d) The sign of charge on the ion alone
Q.12
Which property of colloidal solution is independent of charge on the colloidal particles? [ AIPMT 2014]
  • a) Coagulation
  • b) Electrophoresis
  • c) Electroosmosis
  • d) Tyndall effect
Q.13
Which one of the following statements is incorrect about enzyme catalysis? [ AIPMT 2012]
  • a) Enzymes are mostly proteinous in nature
  • b) Enzyme action is specific
  • c) Enzymes are denatured by UV-rays and at high temperature
  • d) Enzymes are least reactive at optimum temperature
Q.14
Which of the following metals sols cannot be prepared by Bredig's arc method?
  • a) Copper
  • b) Potassium
  • c) Gold
  • d) Platinum
Q.15
Assertion: Zeolites are water softener as well as catalyst Reason: pores in a particular zeolite are of a fixed size and shape,
  • a) Assertion and reason both are correct and Reason is correct explanation of Assertion
  • b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
  • c) Assertion is correct but Reasoning is wrong
  • d) Assertion is wrong but reason is correct
Q.16
Gold number is minimum in case of ...
  • a) Gelatin
  • b) Egg albumin
  • c) Gum arabic
  • d) Starch
Q.17
Which of the following statements is correct for the spontaneous adsorption of a gas? [ AIPMT 2014]
  • a) Δ S is negative and therefore, ΔH should be highly positive
  • b) Δ S is negative and therefore, ΔH should be highly negative
  • c) Δ S is negative and therefore, ΔH should be negative
  • d) Δ S is positive and therefore, ΔH should be highly positive
Q.18
Which of the following is involved in dyeing of fibres
  • a) absorption
  • b) adsorption
  • c) sorption
  • d) all of these
Q.19
The separation of colloidal particles ( or purification of sol) from particles of molecular dimensions is known as …[ Roorkee 1995]
  • a) dialysis
  • b) Pyrolysis
  • c) Peptization
  • d) Photolysis
Q.20
Adsorption of a gas on solid metal surface is spontaneous and exothermic then: … [ IIT 2004]
  • a) S increases
  • b) S decreases
  • c) H increases
  • d) G increases
Q.21
In a reversible reaction role of a catalyst is to
  • a) increase rate of forward reaction only
  • b) increase rate of forward reaction greater than extent that rate of backward reaction
  • c) increases the rate of forward and backward reaction equally
  • d) It increases the yield of reaction
Q.22
Which one of the following is correctly matched?
  • a) Emulsion - Curd
  • b) Foam - Mist
  • c) Aerosol - Smoke
  • d) Solid sol - Cake
Q.23
A negatively charged suspension of clay in water needs for precipitation the minimum amout of
  • a) hydrochloric acid
  • b) aluminium chloride
  • c) sodium hydroxide
  • d) potassium sulphate
Q.24
Catalystic poisonears act by [ Roorkee 1991 ]
  • a) Coagulating the catalyst
  • b) getting adsorbed on the active centres on the surface of catalyst
  • c) Chemical combination with any one of the ractants
  • d) none of the above
Q.25
Egg albumin is ...
  • a) protective colloid
  • b) lyophilic colloid
  • c) reversible colloid
  • d) all of these
Q.26
Purple of cassius is
  • a) colloidal solution of gold
  • b) colloidal solution of silver
  • c) colloidal solution of platinum
  • d) oxyacids of gold
Q.27
Which characteristic is the most important factor in giving rise to peculiar properties of colloids?
  • a) Large size
  • b) small size
  • c) High charge density
  • d) High ratio of surface area to the volume
Q.28
Which of the following colloid can be prepared by electrical dispersion as well as reduction method
  • a) Sulphur
  • b) Ferric hydroxide
  • c) Arsenious sulphide
  • d) Gold
Q.29
Hardy-Schulze rule says that ...
  • a) non-electrolytes have better coagulating action of colloids than electrolytes
  • b) Sol are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge
  • c) Charge of the ions has no effect on the coagulation of sol
  • d) sols are coagulated only by those ions whose charge is similar to that of the sol
Q.30
Which of the following is less than zero during adsorption?
  • a) Δ G
  • b) Δ S
  • c) Δ H
  • d) All of the above
0 h : 0 m : 1 s