(i) Sodium hydroxide solution is added to solution A, a white precipitate is formed which is soluble … three ways in which you can…
(i) Ammonium ion is present in A.
(ii) The cation present in B is copper. Solution B is blue in colour.
(iii) The three ways in which the gas can be identified are as follows :
(a) It gives dense white fumes when a rod dipped in HCl is held in it.
(b) It turns moist red litmus paper blue.
(c) It turns phenolphthalein solution pink.