JEE Main & Advanced Chemistry The d-and f-Block Elements Question Bank Compounds of Transitional Elements

  • question_answer \[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\text{heat}}4{{K}_{2}}Cr{{O}_{4}}+3{{O}_{2}}+X\]. In the above reaction X is  [DCE 2004]

    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\[(C{{r}_{2}}{{O}_{3}})\]. \[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }4{{K}_{2}}C{{r}_{2}}{{O}_{4}}+3{{O}_{2}}+2C{{r}_{2}}{{O}_{3}}\]

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