Q.1
The ability of anion to bring about coagulation of a given colloid depends upon … [ AIMPT 1997]
  • a) its charge
  • b) the sign of the charge alone
  • c) the magnitude of its charge
  • d) both magnitude and sign of its charge
Q.2
Alum helps in purifying water by …[ AIEEE 2002]
  • a) Sulphate part which combines with clay particles
  • b) Making mud water soluble
  • c) Forming Si complex with clay particles
  • d) Aluminium which coagulates the mud particles
Q.3
An increase in the concentration of adsorbate at the surface relative to its concnetration in bulk pahse is called ...
  • a) adsorption
  • b) enthalpy
  • c) absorption
  • d) none of these
Q.4
At the critical micelle concentration (CMC) the surfactant molecules ..[ AIPMT 1998]
  • a) decompose
  • b) dissociate
  • c) associate
  • d) become completely soluble
Q.5
Flocculation value is expressed in terms of ...
  • a) mole per milliliter
  • b) millimole per litre
  • c) gram per litre
  • d) mol per ltre
Q.6
Which one of the following substances gives a positively charged sol?
  • a) Gold
  • b) A metal sulphide
  • c) Ferric hydoxide
  • d) An acidic dye
Q.7
Finly divided catalyst is most effective because
  • a) less surface area is available
  • b) more energy is strored in catalyst
  • c) provides more active sites
  • d) energy of catalyst become less
Q.8
According to Freundlich adsorption isotherm, which of the following is correct? [ AIEEE 2012]
  • a) x/m ∝ p
  • b) x/m ∝ p1/n
  • c) x/m ∝ p0
  • d) All the above are correct for
Q.9
Fog is a colloidal solution of … [ NEET 2016 ]
  • a) Gas in liquid
  • b) Solid in gas
  • c) Gas in gas
  • d) Liquid in gas
Q.10
On adding few drop of dil. HCl or FeCl3 to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. This phenomenon is known as
  • a) dissolution
  • b) peptization
  • c) protection
  • d) dialysis
Q.11
For adsorption of a gas on solid, the plot of log x/m Vs log P is linear with slope equal to : (n being a whole number)
  • a) K
  • b) log k
  • c) n
  • d) 1/n
Q.12
Cloud bursts due to ..
  • a) dense clouds are present in the upper atmosphre
  • b) large amout of water present in cloud
  • c) excess of electrostatic induction in the clouds causesw coagulation
  • d) attractioon towards the electrical charges on the earth
Q.13
The Langmuir adsorption isotherm is deduced by using the assumption that [ AIMPT 2007]
  • a) the adsorption takes place in multilayers
  • b) the adsorption sites are equivalent in their ability to adsorb the particles
  • c) the heat of adsorption varies with coverage
  • d) present in the surface only
Q.14
Adsorption is accompanied by
  • a) decrease in entropy of the system
  • b) decrease in the enthalpy of the system
  • c) decrease in Gibbs free energy
  • d) All of the these
Q.15
A catalyst increases the rate of reaction becuase it: [ EAMCET 1992]
  • a) decreases the collision diameter
  • b) increases the activation energy
  • c) decreases the energy barrire for reaction
  • d) increases the activation energy
Q.16
Tails of coments are visible due to
  • a) Tyndall effect
  • b) Brownian motion
  • c) reflection
  • d) none of these
Q.17
The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide solution increases in the order …[ JEE (Mains) 2012]
  • a) Al3+ < Ba2+ < Na+,
  • b) Al3+ < Na+, < Ba2+
  • c) Na+, < Ba2+ < Al3+
  • d) Ba2+ < Na+, < Al3+
Q.18
When sulphur sol is evaporated solid sulphur is left. On mixing with water no colloidal sol is formed. Sulphur sol is ...
  • a) hydrophobic
  • b) hydrophilic
  • c) reversible
  • d) lyophilic
Q.19
Which plot is the adsorption isobar for chemisorption?
  • a)
    ch-12_qn-152choice_img_no1.png
  • b)
    ch-12_qn-152choice_img_no2.png
  • c)
    ch-12_qn-152choice_img_no3.png
  • d)
    ch-12_qn-152choice_img_no4.png
Q.20
Colloidal solution of arsenious sulphide can be prepared by
  • a) hydrolysis
  • b) electrodispersion
  • c) Condensation
  • d) peptization
Q.21
The catalyst used in the chamber process of sulphuric acid is ..
  • a) Nitric oxide
  • b) Vanadium pentoxide
  • c) nickel
  • d) Platinum
Q.22
Assertion: A catalyst lowers the threshold energy level for reaction. Reason: A catalyst combines with reactant to form an exothermic intermediate and provide another pathway to 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.23
The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below I. [NaCl] = 52 II. [BaCl2] = 0.69 III. [MgSO4] = 0.22 The correct order of their coagulating power is … [ NEET 2016, Phase II]
  • a) I > II > III
  • b) II > I > I > III
  • c) III > II > I
  • d) III > I > II
Q.24
Tyndall effect is due to
  • a) reflection of light
  • b) scattering of liight
  • c) absorption of light
  • d) adsorption of light
Q.25
The suspension of slaked lime in water is known as … [ NEET 2016 phase II]
  • a) lime water
  • b) quicklime
  • c) milk of lime
  • d) Aqueous solution of slaked lime
Q.26
A sol has positiively charged colloidal particles. Which of the following solutions is required in low concentration for coagulation?
  • a) NaCl
  • b) K4[Fe(CN)6]
  • c) ZnCl2
  • d) Na2SO4
Q.27
Who coined the term catalysis and awarded Nobel Prize? [ PET (Bihar) 1997]
  • a) Kolbe
  • b) Rutherford
  • c) Wholer
  • d) Berzellius
Q.28
Which one of the following characteristics is associated with adsorption? [ NEET 2016, phase I]
  • a) ΔG, ΔH and ΔS all are negative
  • b) ΔG, and ΔH are negative but ΔS is positive
  • c) ΔG, and ΔS are negative but ΔH is positive
  • d) ΔG is negative but δH and ΔS are positive
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