31. Which of the following compound is used as an antichlor ?

1. 1. Na₂S

   
   
   

   2. Na₂SO₃

   
   
   

   3. Na₂SO₄

   
   
   

   4. Na₂S₂O₃

   
   
   

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   NA

   Correct Option: D

   NA

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32. The chief one of aluminium is

1. 1. Kaolin

   
   
   

   2. Feldspar

   
   
   

   3. Cryolite

   
   
   

   4. Bauxite

   
   
   

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   NA

   Correct Option: D

   NA

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33. Which one is the most abundant on the earth crust ?

1. 1. Al

   
   
   

   2. B

   
   
   

   3. In

   
   
   

   4. Ga

   
   
   

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   NA

   Correct Option: A

   NA

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34. Which of the following metals are extracted by electrolytic reaction method ?

1. 1. Al

   
   
   

   2. Ag

   
   
   

   3. Cu

   
   
   

   4. Fe

   
   
   

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   NA

   Correct Option: A

   NA

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35. Which of the following does not have bleaching action ?

1. 1. CI₂ (moist)

   
   
   

   2. CaOCI₂

   
   
   

   3. NaCIO

   
   
   

   4. Br₂

   
   
   

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   NA

   Correct Option: D

   NA

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