221. 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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222. Which of the following alkaline earth metal shows properties similar to Al ?

1. 1. Ca

   
   
   

   2. Be

   
   
   

   3. Ba

   
   
   

   4. Sr

   
   
   

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   NA

   Correct Option: B

   NA

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223. Which of the following alkaline earth metals forms covalent compounds ?

1. 1. Magnesium

   
   
   

   2. Calcium

   
   
   

   3. Barium

   
   
   

   4. Beryllium

   
   
   

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   NA

   Correct Option: D

   NA

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224. Which of the following is corrosive sublimate ?

1. 1. HgBr₂

   
   
   

   2. HgCl₂

   
   
   

   3. Hg₂Cl₂

   
   
   

   4. HgSO₄

   
   
   

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   NA

   Correct Option: B

   NA

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225. In Nessler's reagent, the ion present is

1. 1. HgI^2-₄

   
   
   

   2. HgI^2-₂

   
   
   

   3. Hg⁺

   
   
   

   4. Hg²⁺

   
   
   

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   NA

   Correct Option: D

   NA

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