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     EduGorilla 
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    Which of the following statements about redox reactions is/are correct?

    (i)   A substance is said to be reduced if it gains oxygen during a reaction.
    (ii)  A substance is said to be oxidised if it gains electrons during a reaction.
    (iii) A substance is said to be reduced if it loses oxygen during a reaction.
    (iv) A substance is said to be reduced if it gains hydrogen during a reaction.

    Options :-

    1. Only (i) and (ii)
    2. Only (ii) and (iii) 
    3. Only (iii)
    4. Only (iii) and (iv) 
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