Which mixture of the solutions will lead to the formation of nega

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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


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


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+


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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


A.

50 mL of 1 M AgNO3 + 50 mL of 2 M KI

Generally charge present on the colloid is due to adsorption of common ion from dispersion medium. Millimole of KI is maximum in option (2) (50 × 2 = 100) so act as solvent and anion I is adsorbed by the colloid AgI formed

AgNO3 + KI       AgI                 +    KNO3D.P         D.M (excess)     Negative chargedcolloid


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