12th Class Chemistry The p-block Elements-II / p-ब्लॉक तत्व-II Question Bank MCQs - The p-Block Elements

  • question_answer
    What change is observed if \[S{{O}_{2}}\] is passed through acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution?

    A) The solution turns blue

    B) The solution gets decolourised

    C) \[S{{O}_{2}}\] is reduced

    D) Green \[C{{r}_{2}}{{\text{(}S{{O}_{4}}\text{)}}_{3}}\] is formed

    Correct Answer: A

    Solution :

    [a]
    According to this reaction, green colour \[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] is formed, when \[S{{O}_{2}}\] is passed through acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution.
    \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}+3S{{O}_{2}}\to {{K}_{2}}S{{O}_{4}}+\underset{(Green)}{\mathop{C{{r}_{2}}{{(S{{O}_{4}})}_{3}}}}\,+3{{H}_{2}}O\]


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