31. The electrolysis of potassium maganate solution gives

1. 1. KMnO₄ +KOH.

   
   
   

   2. KOH+H₂

   
   
   

   3. KOH+O₂

   
   
   

   4. MnO₂ +KOH

   
   
   

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   NA

   Correct Option: A

   NA

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32. The alkali metal which is a liquid at room temperature is

1. 1. Cs

   
   
   

   2. Rb

   
   
   

   3. Na

   
   
   

   4. Fr

   
   
   

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   NA

   Correct Option: D

   NA

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33. During the process of electrolytic refining of copper, some metals present as impurity settle as anode mud. These are

1. 1. Pb and Zn

   
   
   

   2. Ag and Au

   
   
   

   3. Sn and Ag

   
   
   

   4. Fe and Ni

   
   
   

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   NA

   Correct Option: B

   NA

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34. Which of the following configurations stands an alkaline earth element ?

1. 1. [Ar]4s²

   
   
   

   2. [Ar]3d¹⁰ 4s¹

   
   
   

   3. [Ne]3s²3p²

   
   
   

   4. [Ar]3d¹⁰ 4p¹

   
   
   

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   NA

   Correct Option: A

   NA

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35. Which is soluble in water ?

1. 1. AgF

   
   
   

   2. AgCI

   
   
   

   3. AgBr

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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