246. A colourless gas with smell of rotton fish is

1. 1. SO₂

   
   
   

   2. PH₃

   
   
   

   3. SO₃

   
   
   

   4. O₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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247. The following compound reacts with conc. H₂SO₄ to give CO₂ gas

1. 1. Formic acid

   
   
   

   2. sugar

   
   
   

   3. Oxalic acid

   
   
   

   4. Ethanol

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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248. The order of acidic nature of oxides is

1. 1. CO₂ > P₂O₅ > SO₃

   
   
   

   2. P₂O₅ > CO₂ > SO₃

   
   
   

   3. SO₃ > CO₂ > P₂O₅

   
   
   

   4. SO₃ > P₂O₅ > CO₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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249. 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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250. 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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