Question

Chrome iron ore (x) was heated with dry `Na_(2)CO_(3)` in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. `H_(2)SO_(4)` turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, `NH_(4)Cl` was added. On fractional crystallization, orange red crystals (C ) is formed.
The correct statement is
A. Dichromate ion is stable is basic medium
B. Dichromate is stable in acidic medium
C. Chromate is stable in acidic medium
D. Chromate undergoes hydrolysis to dichromate

Answer 1

Correct Answer - B
`CrO_(4)^(2-)` is stable in basic medium. `Cr_(2)O_(7)^(2-)` is stable in acidic medium