2. Solved Papers
  3. NEET
  4. Chemistry

NEET Chemistry NEET PYQ-The d-and f-Block Elements

  • question_answer
    Acidified \[{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] solution turns green when \[\text{N}{{\text{a}}_{\text{2}}}\text{S}{{\text{O}}_{\text{3}}}\]is added to it. This is due to the formation of [AIPMT (S) 2011]

    A) \[\text{CrO}_{4}^{2-}\]

    B) \[\text{C}{{\text{r}}_{\text{2}}}{{\text{(S}{{\text{O}}_{\text{3}}}\text{)}}_{\text{3}}}\]

    C) \[\text{CrS}{{\text{O}}_{4}}\]

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

    Correct Answer: D

    Solution :

    [d] \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+3N{{a}_{2}}S{{O}_{3}}+4{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}3N{{a}_{2}}S{{O}_{4}}\] \[+{{K}_{2}}S{{O}_{4}}+C{{r}_{2}}{{(S{{O}_{4}})}_{3}}+4{{H}_{2}}O\]


You need to login to perform this action.
You will be redirected in 3 sec spinner