126. Why are noble gases called so ?

1. 1. They react quickly with other compound

   
   
   

   2. Due to their chemical inertness

   
   
   

   3. They react only with carbon compound

   
   
   

   4. They can produce oxygen

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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127. The structure of boric acid is

1. 1. Planer

   
   
   

   2. Tertrahedral

   
   
   

   3. Trigonal planer

   
   
   

   4. Hexagonal

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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128. Which is not correctly matched ?

1. 1. Borazole : B₃N₃H₆

   
   
   

   2. Borax : Na₂B₄O₇.10H₂O

   
   
   

   3. Kernite : Na₂B₄O₆.3H₂O

   
   
   

   4. Othoboric acid :H₃BO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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129. Which of the following is called sulphuric anhydride ?

1. 1. H₂S₂O₆

   
   
   

   2. H₂S₂O₈

   
   
   

   3. SO₂

   
   
   

   4. SO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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130. Which of the following is interhalogen ?

1. 1. IF₅

   
   
   

   2. I⁻₃

   
   
   

   3. CN^-

   
   
   

   4. (CN)₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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