Chemistry · S and p Block Elements
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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?
- A
CrOCl2
- B
COCl2
- C
CrO2Cl2
- D
CrCl6
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)
Cobalt chloride is prepared when aqueous solution of cobalt (II) hydroxide or cobalt(II) carbonate reacts with HCL .
Co(OH)2 + 2HCL(aq) —--> COCl2 +2H20
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)
When chromium react with the halogens: fluorine, chlorine, bromine, and iodine they form colorful compounds
Cr + 3Cl2 —-->CrCl6
Tagged under Chemistry · S and p Block Elements · 2008