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JEE Main & Advanced AIEEE Solved Paper-2002

  • question_answer
    A metal M forms water soluble \[MS{{O}_{4}}\] and inert MO. MO in aqueous solution forms insoluble \[M{{(OH)}_{2}}\] soluble in \[NaOH\]. Metal M is   AIEEE  Solved  Paper-2002

    A) \[Be\]                                      

    B) \[Mg\]                    

    C) \[Ca\]                      

    D)           \[Si\]

    Correct Answer: A

    Solution :

    On moving down water solubility of alkaline earth metals decreases. Oxides and hydroxides of alkaline earth metals are basic, except Be,\[{{(OH)}_{2}}\] is amphoteric. Hence, metal is Be. \[Be{{(OH)}_{2}}+2O{{H}^{-}}\xrightarrow{{}}{{[Be{{(OH)}_{4}}]}^{2-}}\]


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