Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride,

Question:

Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown - red vapours of

  1. $\mathrm{CrO}_{3}$

  2. $\mathrm{Cr}_{2} \mathrm{O}_{3}$

  3. $\mathrm{CrCl}_{3}$

  4. $\mathrm{CrO}_{2} \mathrm{Cl}_{2}$


Correct Option:

Solution:

$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+6 \mathrm{H}_{2} \mathrm{SO}_{4}+4 \mathrm{NaCl} \longrightarrow 2 \mathrm{KHSO}_{4}+4 \mathrm{NaHSO}_{4}+2 \mathrm{CrO}_{2} \mathrm{Cl}_{2}+3 \mathrm{H}_{2} \mathrm{O}$

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