Chemistry

Chemistry

Problem

Solid KCl\text{KCl} , when heated with solid K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7 and concentrated H2SO4\text{H}_2\text{SO}_4 , gives red vapours (a) that turn NaOH\text{NaOH} solution yellow (b). The yellow solution, when acidified with acetic acid and treated with lead acetate, gives a yellow precipitate (c). Which of the following is true with respect to a, b and c? a. a and b contain CrO42−\text{CrO}_4^{2-} b. a and c contain CrO42−\text{CrO}_4^{2-} c. a, b and c contain CrO42−\text{CrO}_4^{2-} d. a, b and c contain Cr(VI)\text{Cr}(\text{VI})

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