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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    Which of the following statement(s) is/are correct when a mixture of \[NaCl\] and \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] is gently warmed with cone. \[{{H}_{2}}S{{O}_{4}}\]?

    A)  A deep red vapours is formed.

    B)  Vapours when passed into \[NaOH\] solution gives a yellow solution of \[N{{a}_{2}}Cr{{O}_{4}}\]

    C)  Chromyl chloride is formed

    D)  All of the these

    Correct Answer: D

    Solution :

    \[4NaCl+{{K}_{2}}C{{r}_{2}}{{O}_{7}}+6{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}\underset{\begin{smallmatrix}  Chromyl\,\,chloride \\  (red\,\,vapour) \end{smallmatrix}}{\mathop{2Cr{{O}_{2}}C{{l}_{2}}}}\,\] \[+4NaHS{{O}_{4}}+2KHS{{O}_{4}}+3{{H}_{2}}O\] \[Cr{{O}_{2}}C{{l}_{2}}+4NaOH\xrightarrow{{}}\underset{yellow\,\,solution}{\mathop{N{{a}_{2}}Cr{{O}_{4}}}}\,+2NaCl+2{{H}_{2}}O\]


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