When an alkali is added to an orange red solution of dichromate, it forms:

Q. When a mixture of potassium dichromate and sodium chloride is heated with concentrated $H_2{SO}_4$, orange-red vapors of chromyl chloride are formed.

If true enter 1, if false enter 0.

Q. When dil. $H_{2}S{O}_4$ is added to aqueous solution of potassium chromate, yellow colour of solution turns to orange colour. It indicates :

Q. When a mixture of solid sodium chloride,potassium dichromate is heated with concentrated sulphuric acid orange red vapours are formed, then compound formed is :

Q. When orange solution containing $C{r}_{2}O{{}_7}^{2-}$ ion is treated with an alkali, a yellow solution is formed and when $H^{+}$ ions are added to yellow solution, an orange solution is obtained. Explain why does this happens?