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

  • question_answer
    Which of the following compounds are slightly soluble or insoluble in\[N{{H}_{4}}OH\]solution? I. \[Ni{{(OH)}_{2}}\]                        II. \[A{{g}_{2}}Cr{{O}_{4}}\] III. \[A{{g}_{2}}Cr{{O}_{4}}\]                       IV. \[Al{{(OH)}_{3}}\] V. \[A{{g}_{2}}C{{O}_{3}}\]

    A)  V only                                 

    B)  I and III

    C)  I, III, IV, V                          

    D)  III, IV

    Correct Answer: D

    Solution :

     ppt. of \[A{{g}_{2}}Cr{{O}_{4}},A{{g}_{2}}C{{O}_{3}}\] are soluble in \[N{{H}_{4}}OH\]due to formation of\[{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\]. Green ppt. of \[Ni{{(OH)}_{2}}\] is soluble in \[N{{H}_{4}}OH\] due to formation of \[{{[Ni{{(N{{H}_{3}})}_{6}}]}^{2+}}\] \[A{{g}_{2}}Cr{{O}_{4}}+4N{{H}_{4}}OH\xrightarrow{{}}2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\] \[+CrO_{4}^{2-}+4{{H}_{2}}O\] \[A{{g}_{2}}C{{O}_{3}}+4N{{H}_{4}}OH\xrightarrow{{}}2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\]\[+CO_{3}^{2-}+4{{H}_{2}}O\] \[\underset{\text{Green ppt}\text{.}}{\mathop{Ni{{(OH)}_{2}}}}\,+8N{{H}_{4}}OH\xrightarrow{{}}{{[Ni{{(N{{H}_{3}})}_{6}}]}^{2+}}\] \[+4O{{H}^{-}}+6{{H}_{2}}O\] \[Fe{{(OH)}_{3}}\]is insoluble in\[N{{H}_{4}}OH\]. \[Al{{(OH)}_{3}}\]is insoluble in\[N{{H}_{4}}OH\].


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