1. In laboratory, sulphur dioxide is prepared by

1. 1. FeS₂ + O₂

   
   
   

   2. S + O₂

   
   
   

   3. FeS + H₂SO₄

   
   
   

   4. Cu + H₂SO₄

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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2. Iodine reacts with hot conc. NaOH to give

1. 1. NaI + NalO₃ + H₂O

   
   
   

   2. Nal + HIO₃ + H₂O

   
   
   

   3. Nal + NalO + O₂

   
   
   

   4. Nal + HIO + O₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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3. Bleaching action of SO₂ is due to its

1. 1. Oxidizing action

   
   
   

   2. Reducing action

   
   
   

   3. Ability to hydrolyse

   
   
   

   4. Acidic nature

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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4. Sapphire is a mineral of

1. 1. Cu

   
   
   

   2. Ca

   
   
   

   3. Fe

   
   
   

   4. Al

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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5. Which of the following is the second most abundant element in the earth's crust

1. 1. Silicon

   
   
   

   2. Carbon

   
   
   

   3. Nitrogen

   
   
   

   4. Oxygen

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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