Question

The incorrect statement in respect of chromyl chloride test is

• A. formation of red vapours
• B. formation of lead chromate
• C. formation of chromyl chloride
• D. liberation of chlorine

Answer 1

Answer: (D)

Chromyl chloride test is used for $C{l}^{-}$ ions. Chlorine is not liberated in this test.
$4NaCl+K_{2}C{r}_2{O}_7+3H_{2}S{O}_4⟶K_{2}S{O}_4+2N{a}_{2}S{O}_4+\underset{\stackrel{\text{chromyl chloride}}{\text{(reddish brown vapour)}}}{2Cr{O}_{2}C{l}_2\uparrow }+3H_{2}O$
$Cr{O}_{2}C{l}_2+4NaOH⟶2NaCl+N{a}_{2}Cr{O}_4+2H_{2}O$
$N{a}_{2}Cr{O}_4+{\left(C{H}_{3}COO\right)}_{2}Pb⟶2C{H}_{3}COONa+\underset{\text{lead chromate}}{PbCr{O}_4}$