A solution of `K _(2)CrO_(4)` changes colour on being acidified. Why?

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. The salt A is:

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. On treatment with a KI solution, an aqueous solution of A will give:

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with diolute H_(2)SO_(4) , boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) . concentratd H_(2)SO_(4) is added to the resulting solution. a brownn ring is formed at the junction of the two layers. Q. A solution of A, when treated with NH_(3) , gives:

The yellow colour solution of Na_(2)CrO_(4) changes to orange red on passing CO_(2) gas due to the formation of :-

Yellow coloured aquesous solution of sodium chromate changes to orange when acidified with sulphuric acid because

Assertion : K_(2)CrO_(4) has yellow colour due to charge transfer. Reason : CrO_(4)^(2-) ion is tetrahedral in shape.

Assertion : Solution of Na_(2) CrO_(4) in water is intensely coloured Reason : Oxidation state of Cr in Na_(2) CrO_(4) is + VI .

When acidified solution of K_(2)Cr_(2)O_(7) is shaken with aqeous solution of FeSO_(4) , Then:

What happens when a molten mixture of K_(2)FeO_(4) and K_(2)CrO_(4) is acidified?

When SO_2 gas is passed through an acidified solution of K_2 Cr_2 O_7 , the solution turns ___ in colour.