The amount of electrolytes required to coagulate a given amount o

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 Multiple Choice QuestionsMultiple Choice Questions

211.

The correct statement regarding the following energy diagrams is

  • Reaction M is faster and less exothermic than reaction N

  • Reaction M is slower and less exothermic than reaction N

  • Reaction M is faster and more exothermic than reaction N

  • Reaction M is slower and more exothermic than reaction N


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212.

The amount of electrolytes required to coagulate a given amount of AgI colloidal solution (-ve charge) will be in the order

  • NaNO3 > Al2(NO3)3 > Ba(NO3)2

  • Al2(NO3)3 > Ba(NO3)2 > NaNO3

  • Al2(NO3)2 > NaNO3 > Ba(NO3)2

  • NaNO3 > Ba(NO3)2 > Al2(NO3)3


D.

NaNO3 > Ba(NO3)2 > Al2(NO3)3

According Hardy Schulze law, higher the positive charge on the metal atom, more is the tendency of metal atom to cause coagulation of negatively charged colloid (AgI is negatively charged solution).The order of positive charge is 

Na+ < Ba2+ < Al3+

Thus, the order of amount of electrolytes required is in the order

NaNO3 > Ba(NO3)2 > Al2(NO3)3


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213.

The decomposition of hydrogen peroxide  can be slowed by the addition of acetamide. The latter acts as a

  • detainer

  • stopper

  • promoter

  • inhibitor


214.

Which of the following is correct according to adsorption isotherm ?

  • Xm p°

  • Xm P'

  • Xm   p1n

  • All of these


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215.

The formation of colloid from suspension is

  • peptisation

  • condensation

  • fragmentation

  • sedimentation


216.

Which of the following has maximum value of flocculating power ?

  • Pb2+

  • Pb4+

  • Sr2+

  • Na+


217.

Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l– sol ?

  • 50 mL of 1 M AgNO3 + 50 mL of 2 M KI

  • 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI

  • 50 mL of 0.1M M AgNO3 + 50 mL of 0.1 M KI

  • 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI


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