Verified Solution • 2025–26 Session moderate

QJEEM23Ch9277: JEE Main 2023 Chemistry - Class 12 JEEM23Ch9277 Solution: During the qualitative analysis of using dilute gas is evolved…

During the qualitative analysis of SO32−\mathrm{SO}_{3}^{2-} using dilute H2SO4,SO2\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2} gas is evolved which turns K2Cr2O7\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} solution (acidified with dilute H2SO4\mathrm{H}_{2} \mathrm{SO}_{4} ) :

Multiple Choice Options

  • A blue
  • B black
  • C red
  • D green

Step-by-Step Verified Solution

SO2+Cr2O72−⟶Cr3+(green)+SO42−\mathrm{S{O_2} + C{r_2}O_7^{2 - }\mathrel{\mathop{\kern0pt\longrightarrow}\limits_{}} \mathop {C{r^{3 + }}}\limits_{(green)} + SO_4^{2 - }}

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