31. The Brownian motion is due to

1. 1. temperature fluctiation within the liquid phase

   
   
   

   2. attraction and repulsion between charges on the colloidal particles

   
   
   

   3. impact of the molecules of the dispersion medium on the colloidal particles

   
   
   

   4. convection currents

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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32. A photochemical reaction is

1. 1. catalysed by light

   
   
   

   2. intitiated by light emission

   
   
   

   3. accompanied with light

   
   
   

   4. accompanied with absorption of light

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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33. The catalyst used in the manufacture of hydrogen by Bosch process is

1. 1. Fe₂O₃

   
   
   

   2. Cr₂O₃

   
   
   

   3. Fe₂O₃ + Cr₂O₃

   
   
   

   4. Cu

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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34. When river water meets sea water delta formation takes place. It is due to the phenomenon of

1. 1. Dialysis

   
   
   

   2. Coagulation

   
   
   

   3. Electrophoresis

   
   
   

   4. Absorption

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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35. The catalyst used in the manufacture of sulphuric acid by contact process is

1. 1. AI₂O₃

   
   
   

   2. Cr₂O₃

   
   
   

   3. V₂O₅

   
   
   

   4. MnO₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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