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JEE Main & Advanced Sample Paper JEE Main Sample Paper-10

  • question_answer
    In the electrolysis of aquous\[NaCl\]solution, side reactions taking place are I.\[2O{{H}^{-}}+C{{l}_{2}}\xrightarrow{{}}2OC{{l}^{-}}+{{H}_{2}}\] II.\[2Na+2{{H}_{2}}O\xrightarrow{{}}2NaOH+{{H}_{2}}\] III.\[4O{{H}^{-}}\xrightarrow{{}}{{O}_{2}}+2{{H}_{2}}+4{{e}^{-}}\] Select the correct alternative.

    A)  All I, II, III                           

    B)  l, ll

    C)  II, III                     

    D)  I, III

    Correct Answer: D

    Solution :

     Idea This problem is based on concept of electrolysis of Nad (aq) and redox reaction. This problem completes in various sequential steps, students are advised to solve the question step by step. Aqueous \[NaCl\]is \[NaCl+{{H}_{2}}O\] \[NaCl\xrightarrow[{}]{{}}N{{a}^{+}}+C{{l}^{-}}\] Strong electrolyte \[{{H}_{2}}O{{H}^{+}}+O{{H}^{+}}\] Weak electrolyte So, \[O{{H}^{-}}\] combine with \[C{{l}_{2}}\] and \[O{{H}^{-}}\] will be oxidized. TEST Edge This type of question is generally asked in JEE Main, so students are advised to go through concept of electrolysis and redox reaction. The question related to redox reaction may also be asked with conceptual mixing of acid-base concept.


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