Question

On passing the vapours of chromyl chloride in sodium hydroxide solution gives a compound whose central atom has oxidation state of :

Answer 1

If these Chromyl Chloride vapors are passed through a dilute NaOH solution, it turns yellow. The color is due to the formation of the Chromate ions in which $Cr$ is in +6 oxidation state.

Oxidation state of chromium in its compound is $+6$ as $N{a}_{2}C{r}_2{O}_7$

$Na=+1$

$O=-2$

$Cr=+6$

$2K^{+}$ + $C{r}_2{O}_7^{-2}$