Which of the following solid salt on heating with solid K2Cr2O7 and conc. H2SO4 orange red vapours a — d and f Block Elements Chemistry Question
Question
Which of the following solid salt on heating with solid K2Cr2O7 and conc. H2SO4 orange red vapours are evolved which turn aqueous NaOH solution yellow ?
Answer: B
💡 Solution & Explanation
NaCl(s) + K2Cr2O7(s) + H2SO4(few drops) $\rightarrow$ CrO2Cl2$\uparrow$ (orange red vapours) + H2O<br>CrO2Cl2 + OH^-(aq.) $\rightarrow$ CrO4^2-(aq.) (Yellow solution) + Cl^- + 2H2O
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