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JEE Main & Advanced Sample Paper JEE Main Sample Paper-5

  • question_answer
    \[\underset{\begin{smallmatrix}  \text{Imparts}\,\text{violet} \\  \text{colour}\,\text{to}\,\text{flame} \end{smallmatrix}}{\mathop{\text{A}}}\,\xrightarrow[{}]{\text{compound}\,\text{(P)+conc}\text{.}{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}}\underset{\text{Red}\,\text{gas}}{\mathop{\text{B}}}\,\xrightarrow[{}]{\text{NaOH+AgN}{{\text{O}}_{\text{3}}}}\]\[\underset{\text{Red}\,\text{ppt,}}{\mathop{\text{C}}}\,\xrightarrow[\text{solution}]{\text{N}{{\text{H}}_{\text{3}}}}\text{D}\]\[\text{C}\xrightarrow[{}]{\text{Dil}\,\text{HCl}}\text{X}\]white ppt. \[\text{P}\xrightarrow[\text{Heat}]{\text{NaOH}}\text{Q}\]Gas (gives white fumes with HCl) Then, A, B, C, D, X , P and Q are

    A)  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}},Cr{{O}_{2}}C{{l}_{2}},A{{g}_{2}}Cr{{O}_{4}},{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}},\]\[AgCl,N{{H}_{4}}Cl\]and\[N{{H}_{3}}\]

    B)  \[{{K}_{2}}Cr{{O}_{4}},C{{l}_{2}},A{{g}_{2}}Cr{{O}_{4}},AgN{{O}_{3}},AgCl,N{{H}_{4}}Cl\]and\[N{{H}_{3}}\]

    C)  \[KMn{{O}_{4}},C{{l}_{2}},A{{g}_{2}}Cr{{O}_{4}},{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}},\]\[AgCl{{(N{{H}_{4}})}_{2}}S{{O}_{4}},\]and\[{{N}_{2}}\]

    D)  \[KMn{{O}_{4}},Cr{{O}_{2}}C{{l}_{2}},A{{g}_{2}}(Cr{{O}_{4}}),{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}},\]\[AgN{{O}_{3}},N{{H}_{4}}Cl\]and\[{{N}_{2}}\]

    Correct Answer: A

    Solution :

     \[\underset{(A)}{\mathop{C{{r}_{2}}O_{7}^{2-}}}\,+6{{H}^{+}}+\underset{(P)}{\mathop{4N{{H}_{4}}Cl}}\,\xrightarrow[{}]{{}}\underset{(B)}{\mathop{2Cr{{O}_{2}}C{{l}_{2}}}}\,\]\[+4NH_{4}^{+}+3{{H}_{2}}O\] \[Cr{{O}_{2}}C{{l}_{2}}+2NaOH\xrightarrow[{}]{{}}N{{a}_{2}}Cr{{O}_{4}}+2HCl\]\[N{{a}_{2}}Cr{{O}_{4}}+2AgN{{O}_{3}}\xrightarrow[{}]{{}}\underset{(C)}{\mathop{A{{g}_{2}}}}\,Cr{{O}_{4}}+2NaN{{O}_{3}}\]\[A{{g}_{2}}Cr{{O}_{4}}+4N{{H}_{3}}\xrightarrow[{}]{{}}2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}+CrO_{4}^{2-}\]\[A{{g}_{2}}Cr{{O}_{4}}+2HCl\xrightarrow[{}]{{}}\underset{(X)}{\mathop{2AgCl}}\,\downarrow +2{{H}^{+}}+CrO_{4}^{2-}\]\[\underset{(P)}{\mathop{N{{H}_{4}}Cl}}\,+NaOH\xrightarrow[{}]{{}}\underset{(Q)}{\mathop{N{{H}_{3}}}}\,\uparrow +NaCl+{{H}_{2}}O\]


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