The velocity of oxidation of oxalic acid by acidified KMnO4 

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 Multiple Choice QuestionsMultiple Choice Questions

131.

Which one of the following characteristics is not correct for physical adsorption ?

  • Adsorption on solids is reversible

  • Adsorption increases with increase in temperature

  • Adsorption is spontaneous

  • Both enthalpy and entropy of adsorption are negative


132.

Size of colloidal particles is in the range :

  • 0.05 mµ -0.1 mµ

  • 25µ - 30µ

  • 0.1 µ- 1mµ

  • 10µ - 20µ


133.

Which is more powerful to coagulate the negative colloid?

  • ZnSO4

  • Na3PO4

  • AlCl3

  • K4[Fe(CN)6]


134.

Hydrolysis of urea is an example of

  • homogenous catalysis

  • heterogenous catalysis

  • biochemical catalysis

  • zeolite catalysis


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135.

The velocity of oxidation of oxalic acid by acidified KMnO4 increases as the reaction progress. It is an example of

  • promoters

  • catalytic poisons

  • autocatalysis

  • inhibitors


C.

autocatalysis

When one of the the products of a reaction acts as a catalyst for that reaction, the phenomenon is known as auto catalysis.

When KMnO4 solution is added to oxalic acid, the disappearance of pink colour is slow at start but as soon as some Mn2+ ions are formed the disappearance of colour becomes fust.

2MnO4- + 5C2O42- + 16H+ → 2Mn2+ + 10CO2 + 8H2O

2KMnO4 + 5H2C2O4 + 3H2SO4 → 2MnSO4 + K2SO4 + 8H2O + 10SO2

Mn2+ ion acts as a catalyst in this reaction.


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136.

Which of the following is not a property of colloidal solution?

  • Heterogeneity

  • Particle size > 100 nm

  • Tyndall effect

  • Brownian movement


137.

Alloy is an example of

  • gel

  • solidified emulsion

  • solid solution

  • sol


138.

Which of the following is an intrinsic colloid ?

  • Glue

  • Arsenic sulphide

  • Gold

  • All of these


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139.

Coagulation is not done by

  • persistant dialysis

  • boiling

  • electrophoresis

  • peptisation


140.

The homogeneous catalysis is shown by

  • Haber's process, N2 + 3H2 Fe 2NH3

  • Ostwald process, 4NH3 + 5O2 Pt 4NO + 6H2O

  • Contact process, 2SO2 + O2 Pt 2SO3

  • 2C2H5OH H2SO4 C2H5-O-C2H5 + H2O


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