Plot of log x/m against log p is a straight line inclined at an a

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Which one of the following impurities present in colloidal solution cannot be remove by electrodialysis ?

  • Sodium chloride

  • Potassium sulphate

  • Urea

  • Calcium chloride


32.

The number of moles of lead nitrate needed to coagulate 2 moles of colloidal [AgI]I- is

  • 2

  • 1

  • 1/2

  • 2/3


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33.

Plot of log x/m against log p is a straight line inclined at an angle of 45°. When the pressure is 0.5 atm and Freundlich parameter, k is 10, the amount of solute adsorbed per gram of adsorbent will be (log 5 = 0.6990).

  • 1g

  • 2g

  • 3g

  • 5g


D.

5g

Freundlich adsorption isotherm equation is

          xm=kp1/nOn taking log both side          logxm= log k+1nlog p          logxm= log10 +1nlog0.5( slope=1n= tanΘ=tan 45°=1)         logxm=1+11log (5×10-1)         logxm= 1- 0.6990 +1                   = 0.6990              xm= 5.00                   = 5g       


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34.

On adding 1 mL of solution of 10% NaCl to 10 mL of gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. The gold number of starch is

  • 250

  • 25

  • 2.5

  • 0.25


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35.

Lyophilic sols are more stable than lyophobic sols because the particles :

  • are positively charged

  • are negatively charged

  • are solvated

  • repel each other


36.

Potassium stearate is obtained by the saponification of an oil or fat. It has the formula CH3–(CH2)16 .The molecule has a lyophobic end [CH3] and a lyophilic 'end COO- K+.Potassium stearate is an example for:

  • lyophobic colloid

  • associated colloid or micelle

  • lyophilic colloid

  • multimolecular colloid


37.

On addition of 1 mL solution of 10% NaCl to 10 mL gold solution in the presence of 0.025 g of starch, the coagulation is prevented because starch has the following gold numbers :

  • 25

  • 0.025

  • 0.25

  • 2.5


38.

When a beam of light is passed through a colloidal solution it :

  • is reflected

  • is scattered

  • transmitted

  • absorbed


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39.

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

  • Na+ > Al3+ > Ba2+

  • PO43- > SO42- > Cl-

  • Cl > SO42- > PO43-

  • Al3+ > Ba2+ > Na+


40.

Colligative properties are used for the determination of :

  • molar mass

  • equivalent weight

  • arrangement of molecules

  • melting point and boiling point


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