Conc:H2SO4 is added to a mixture of K2CR2O7 and metal chloride is solid scale. Brown vapors are formed. Which one is the correct formula?
Correct answer: C. CrO2Cl2
- A. CrOCl2
- B. COCl2
- C. CrO2Cl2
- D. CrCl6
Explanation
When a mixture of K2CR2O7 and metal chloride is added in warm conc: H2SO4 Chromyl chloride ( CrO2Cl2) which forms a deep reddish brown color vapors These vapors when passed into NaOH solution gives a yellow solution of Na2CrO4. 6H2SO4 + K2CR2O7 + 4NaCl --> 2KHSO4 + 4NaHSO4 + 2CrO2Cl2 +3 H20 CrO2Cl2 + 2NaOH → Na2CrO4 + 2HCL (YELLOW SOLUTION)
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