JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Valency and oxidation state

  • question_answer 3 and 6 electrons are present in the outermost orbit of A and B respectively. The chemical formula of its compound will be

    A) \[{{A}_{3}}{{B}_{2}}\]

    B) \[{{A}_{2}}{{B}_{3}}\]

    C) \[{{A}_{2}}B\]

    D) \[AB\]

    Correct Answer: B

    Solution :

    \[{{A}_{2}}{{B}_{3}}\] \[A\xrightarrow{-3{{e}^{-}}}{{A}^{+3}}\];  \[B\xrightarrow{+2{{e}^{-}}}{{B}^{-2}}\]

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