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JEE Main & Advanced Sample Paper JEE Main Sample Paper-46

  • question_answer
    A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow precipitate with a solution of Kl. When a solution of \[BaC{{l}_{2}}\]is added to a solution of powder, a white precipitate results. This white powder may be

    A)  a soluble sulphate      

    B)  \[KBr\] or \[NaBr\]

    C)  \[Ba{{(N{{O}_{3}})}_{2}}\]                     

    D)  \[AgN{{O}_{3}}\]

    Correct Answer: D

    Solution :

     Since the powder gives brown fumes, it must be a bromide or nitrate. Since, its solution gives yellow ppt. with KI and white ppt. with \[BaC{{l}_{2}}\] it must be \[AgN{{O}_{3}}\]. \[AgN{{O}_{3}}+KI\xrightarrow{\,}\underset{Yello}{\mathop{AgI}}\,\,\,+KN{{O}_{3}}\] \[2AgN{{O}_{3}}+BaC{{l}_{2}}\xrightarrow{\,}\underset{\text{White}\,\text{ppt}\text{.}}{\mathop{\,2AgCl}}\,+Ba{{(N{{O}_{3}})}_{2}}\]


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