211. Which of the following ion is diamagnetic here ?

1. 1. Cu⁺

   
   
   

   2. Zn²⁺

   
   
   

   3. Sc³⁺

   
   
   

   4. All of these

   
   
   

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   NA

   Correct Option: D

   NA

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212. Which of the following ion is colourless ?

1. 1. Cu⁺

   
   
   

   2. Ni²⁺

   
   
   

   3. Fe²⁺

   
   
   

   4. Fe³⁺

   
   
   

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   NA

   Correct Option: A

   NA

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213. The highest oxidation state shown by any transition element is

1. 1. +8

   
   
   

   2. +7

   
   
   

   3. +6

   
   
   

   4. +2

   
   
   

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   NA

   Correct Option: A

   NA

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214. An extremely hot copper wire reacts with steam to give

1. 1. Cu₂O

   
   
   

   2. CuO₂

   
   
   

   3. Cu₂O₂

   
   
   

   4. CuO

   
   
   

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   NA

   Correct Option: D

   NA

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215. Which of the following metals is present in brass, bronze and german silver ?

1. 1. Mg

   
   
   

   2. Cu

   
   
   

   3. Al

   
   
   

   4. Na

   
   
   

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   NA

   Correct Option: B

   NA

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