6. In an electrolytic cell, the electrode at which the electron enters the solution is known as cathode while the change takes place at this electrode is known as

1. 1. reduction

   
   
   

   2. oxidation

   
   
   

   3. ionisation

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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7. The common oxidation state of alkali metals in the combined state is

1. 1. +1

   
   
   

   2. +2

   
   
   

   3. -1

   
   
   

   4. -2

   
   
   

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   NA

   Correct Option: A

   NA

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8. The oxidation number and covalency of sulphur in S₈ is

1. 1. +2, 0

   
   
   

   2. 0, 2

   
   
   

   3. 0, 8

   
   
   

   4. 6, 2

   
   
   

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   NA

   Correct Option: B

   NA

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9. The oxidation number of nitrogen is NO^-₃ is

1. 1. -1

   
   
   

   2. +2

   
   
   

   3. +3

   
   
   

   4. +5

   
   
   

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   NA

   Correct Option: D

   NA

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10. The value of n in the following equation is Cr₂O^2-₇ + 14H⁺ + ne→ 2 Cr³⁺ + 7H₂O⁺

1. 1. 6

   
   
   

   2. 2

   
   
   

   3. 3

   
   
   

   4. 4

   
   
   

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   NA

   Correct Option: A

   NA

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