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Haryana PMT Haryana PMT Solved Paper-2006

  • question_answer
    \[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{heat}4{{K}_{2}}Cr{{O}_{4}}+3{{O}_{2}}+X\] heat In the above reaction X is:

    A)  \[Cr{{O}_{3}}\]                                

    B)  \[C{{r}_{2}}{{O}_{7}}\]

    C)  \[C{{r}_{2}}{{O}_{3}}\]                 

    D)  \[Cr{{O}_{5}}\]

    Correct Answer: C

    Solution :

                    Potassium dichromate on heating gives oxygen and chromic oxide \[(C{{r}_{2}}{{O}_{3}})\]. \[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }4{{K}_{2}}Cr{{O}_{4}}+3{{O}_{2}}+2C{{r}_{2}}{{O}_{3}}\]


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