36. Which one of the following has largest size ?

1. 1. C^4-

   
   
   

   2. N^-3

   
   
   

   3. O^-2

   
   
   

   4. F^-

   
   
   

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   NA

   Correct Option: A

   NA

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37. Which is chemically most active non-metal ?

1. 1. F₂

   
   
   

   2. He

   
   
   

   3. N₂

   
   
   

   4. O₂

   
   
   

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   NA

   Correct Option: A

   NA

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38. Metal with maximum density here is

1. 1. Fe

   
   
   

   2. Mo

   
   
   

   3. Hg

   
   
   

   4. Os

   
   
   

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   NA

   Correct Option: D

   NA

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39. Which of the following transition metal is in liquid state ?

1. 1. Chromium

   
   
   

   2. Cadmium

   
   
   

   3. Mercury

   
   
   

   4. Vanadium

   
   
   

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   NA

   Correct Option: C

   NA

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40. The first elements of rare earth metal is

1. 1. Cerium

   
   
   

   2. Actinium

   
   
   

   3. Uranium

   
   
   

   4. Lanthanum

   
   
   

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   NA

   Correct Option: A

   NA

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