Solid , when heated with solid and concentrated , gives red vapours (a) that turn…

CHEMISTRY · Single correct · ICSE · Chemistry · Analytical Chemistry · Analytical 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? (1) a and b contain CrO42−\text{CrO}_4^{2-} (2) a and c contain CrO42−\text{CrO}_4^{2-} (3) a, b and c contain CrO42−\text{CrO}_4^{2-} (4) a, b and c contain Cr(VI)\text{Cr}(\text{VI})

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