1. A redox reaction is

1. 1. proton transfer reaction

   
   
   

   2. ion combination reaction

   
   
   

   3. a reaction is solution

   
   
   

   4. electron transfer reaction

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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2. The oxidation state of Cr in K₂Cr₇ is

1. 1. +7

   
   
   

   2. +6

   
   
   

   3. +3

   
   
   

   4. +2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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3. Oxidation number of 'S' in Na₂S₄O₆ is

1. 1. + 0.5

   
   
   

   2. 2.5

   
   
   

   3. +4

   
   
   

   4. +6

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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4. The oxidation number of iron in Fe₃O₄ is

1. 1. +2

   
   
   

   2. +3

   
   
   

   3. 8/3

   
   
   

   4. 2/3

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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5. The oxidation number of Fe in K₄[Fe(CN₆)] is

1. 1. +6

   
   
   

   2. +4

   
   
   

   3. +3

   
   
   

   4. +2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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