JEE Questions for Chemistry Surface Chemistry Quiz 6 - MCQExams.com

The size of colloidal particles is
  • 10-6 - 10-9
  • 10-9 - 10-12
  • 10-3 - 10-9
  • 10-12 - 10-19
The process which is catalysed by one of the products is called
  • Acid-base catalysis
  • Auto catalysis
  • Negative catalysis
  • Positive catalysis
In physical adsorption, the forces associated are
  • Ionic
  • Covalent
  • Van der Waal
  • H-bonding
Which is used for ending charge on colloidal solution
  • Electrolytes
  • Electrons
  • Positively charged ions
  • Compounds
Which of the following is most effective in causing the coagulation of ferric hydroxide sol?
  • KCl
  • KNO3
  • K2SO4
  • K3[Fe(CN)6]
When H2S gas is passed through nitric acid, the product is
  • Rhombic S
  • Prismatic S
  • Amorphous S
  • Monoclinic S
The formation of colloid from suspension is
  • Peptisation
  • Condensation
  • Sedimentation
  • Fragmentation
In the case of auto catalysis
  • reactant catalyses
  • heat produced in the reaction catalyses
  • product catalyses
  • solvent catalyses
Which among the following statements is false?
  • Increase of pressure increases the amount of adsorption
  • Increase of temperature may decrease the amount of adsorption
  • The adsorption may be monolayered or multilayered
  • Particle size of the adsorbent will not affect the amount of adsorption
The simplest way to check whether a system is colloidal is by
  • Tyndall effect
  • Brownian movement
  • Electrodialysis
  • Finding out particle size
Adsorbed acetic acid on activated charcoal is:
  • Adsorber
  • Absorber
  • Adsorbent
  • Adsorbate
Alum helps in purifying water by
  • forming Si complex with clay particles
  • sulphate part which combines with the dirt and removes it
  • aluminium which coagulates the mud particles
  • making mud water soluble
According to adsorption theory of catalysis, the speed of the reaction increases because
  • the concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption
  • in the process of adsorption, the activation energy of the molecules becomes large
  • adsorption produces heat which increases the speed of reaction
  • adsorption lowers the activation energy of the reaction
Which one of the following characteristics is not correct for physical adsorption?
  • Adsorption increases with increase in temperature
  • Adsorption is spontaneous
  • Both enthalpy and entropy of adsorption are negative
  • Adsorption on solids is reversible
The coagulating power of an electrolyte for arsenious sulphide decreases in the order

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  • 2)
    Chemistry-Surface Chemistry-8368.png

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  • Chemistry-Surface Chemistry-8370.png
Rate of physisorption increases with
  • decrease in temperature
  • increase in temperature
  • decrease in pressure
  • decrease in surface area
Which one is an example of miscelles system?
  • Soap + water
  • Rubber + benzene
  • Protein + water
  • None of these
At isoelectric point
  • colloidal particles become uncharged
  • Colloidal sol becomes highly stable
  • Peptisation can be carried out
  • None of these
Gold number was given by
  • Ostwald
  • Zsigmondy
  • Williams and Chang
  • Langmuir
Sedimentation potential is the reverse of
  • Electroomosis
  • Electrophoresis
  • Electrokinetic potential
  • Dorn potential
Electroosmosis was discovered by
  • Dorn
  • Reuss and Porret
  • Freundlich
  • Langmuir
50 ml of 1 M oxalic acid is shaken with 0.5 g wood charcoal. The final concentration of the solution after adsorption is 0.5 M. What is the amount of oxalic acid absorbed per gm of carbon?
  • 3.15 g
  • 3.45 g
  • 6.30 g
  • None
Collodion is a colloidal solution of
  • sucrose in water
  • Cellulose in water
  • Cellulose nitrate in water
  • Cellulose nitrate in ethanol
Ferric chloride is applied to stop bleeding because
  • Fe3+ ions coagulate negatively charged blood solution
  • Fe3+ ions coagulate positively charged blood solution
  • Cl- ions coagulate positively charged blood solution
  • Cl- ions coagulate negatively charged blood solution
ZSM-5 converts
  • Alcohol to petrol
  • Benzene to toluene
  • Toluene to benzene
  • Heptane to toluene
Which among the following statements are correct with respect to adsorption of gases on a solid?
I. The extent of adsorption is equal to kpn according to Freundlich isotherm,
II. The extent of adsorption is equal to kp1/n according to Freundlich isotherm.
III. The extent of adsorption is equal to (1 + bp) / ap according to Langmir isotherm.
IV. The extent of adsorption is equal to ap / (1 + bp) according to Langmir isotherm.
V. Freundlich adsorption isotherm fails at low pressure, where k, a and b are constants and p is pressure.
  • I and III
  • I and IV
  • II and III
  • II and IV
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