266. The order of electron affinity of halogen is

1. 1. CI>F>Br>I

   
   
   

   2. I>Br>CI>F

   
   
   

   3. CI>Br>F>I

   
   
   

   4. F>CI>Br>I

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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267. Which of the element of group 17 is radioactive ?

1. 1. Iodine

   
   
   

   2. Astatine

   
   
   

   3. Bromine

   
   
   

   4. Chlorine

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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268. Which of the following is metallic in nature ?

1. 1. F

   
   
   

   2. CI

   
   
   

   3. Br

   
   
   

   4. I

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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269. Which one of the following is solid at room temperature ?

1. 1. CI₂

   
   
   

   2. F₂

   
   
   

   3. I₂

   
   
   

   4. Br₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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270. Iodine deficiency in diet is known to cause

1. 1. Beri-beri

   
   
   

   2. Goitre

   
   
   

   3. Rickets

   
   
   

   4. Night-blindnets

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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