Aqueous solution of carnallite gives positive test for

Alum in aqueous solution gives positive test for (A) K^(+) (B) Al^(3+) (C) SO_(4)^(2-)

Alum in aqueous solution gives positive test for (A) K^(+) , (B) Al^(3+) , (C) SO_4^(2-)

An aqueous solution of potassium gives

An aqueous solution of sodium carbonate gives alkaline tests . Why ?

Glucose does not give positive test with

Aqueous solution of Fe SO_4 gives tests for both Fe^(2+) and SO_4^(2-) but after addition of excess of KCN, solution ceases to give test for Fe^(2+) . This is due to the formation of: