21. During electrolysis the reaction at anode is

1. 1. Oxidation

   
   
   

   2. Reduction

   
   
   

   3. Decomposition

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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22. The oxidation state of C in C₂H₁₂O₆ is

1. 1. +1

   
   
   

   2. +2

   
   
   

   3. 0

   
   
   

   4. None

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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23. Match List-I (Oxidation number) with List-II (The element) ad select the correct answer using the code given below the list :
    

    	List-I (Oxidation number)		List-II(The element)
    F.	2	1.	Oxidation number of Mn in MnO2
    G.	3	2.	Oxidation number of S in H2S2O7
    H.	4	3.	Oxidation number of Ca in CaO
    J.	6	4.	Oxidation number of Al in NaAIH4

    Codes :

    	F	G	H	J
    A.	3	4	1	2
    B.	4	3	1	2
    C.	3	4	2	1
    D.	4	3	2	1

1. 1. A.

   
   
   

   2. B.

   
   
   

   3. C.

   
   
   

   4. D.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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24. The oxidation state of nitrogen in N₃H is

1. 1. + 1/2

   
   
   

   2. +3

   
   
   

   3. -1

   
   
   

   4. -1/2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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25. Consider the following statements
    1. Phosphorous exhibits oxidation states of 3 and 5
    2. Iron exhibits oxidation state + 2 and + 3
    Which of the statement given above is/are correct ?

1. 1. 1 only

   
   
   

   2. 2 only

   
   
   

   3. Both 1 and 2

   
   
   

   4. Neither 1 nor 2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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