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  4. Which of the following is not soluble in NaOH?

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Q. Which of the following is not soluble in $ NaOH$?

Punjab PMETPunjab PMET 2005The d-and f-Block Elements

Solution:

$ Fe{{(OH)}_{3}} $ ferric hydroxide is not soluble in $ NaOH $ $ Zn{{(OH)}_{2}}+2NaOH\xrightarrow{{}}N{{a}_{2}}Zn{{O}_{3}}+2{{H}_{2}}O $ $ Al{{(OH)}_{3}}+NaOH\xrightarrow{{}}NaAl{{O}_{2}}+2{{H}_{2}}O $ $ Sn{{(OH)}_{2}}+2NaOH\xrightarrow{{}}N{{a}_{2}}Sn{{O}_{2}}+2{{H}_{2}}O $