An unknown inorganic salt S is treated with aqueous NaOH and warmed, evolving a colourless gas G . Gas G produces a brown precipitate when passed through Nessler's reagent. An aqueous solution of salt S is treated with dilute HNO ₃ followed by AgNO ₃ solution, yielding a curdy white precipitate that is completely soluble in an aqueous solution of gas G . The chemical identity of the unknown salt S is:

Step-by-step solution

When salt S is treated with aqueous NaOH and warmed, a colourless gas G is evolved which gives a brown precipitate with Nessler's reagent. This confirms that gas G is ammonia ( NH ₃ ) and the salt S contains the ammonium cation ( NH ₄^+ ). When the aqueous solution of salt S is treated with dilute HNO ₃ and AgNO ₃ , a curdy white precipitate is formed. This indicates the presence of chloride ions ( Cl ^- ), as silver chloride ( AgCl ) is a curdy white precipitate. The precipitate AgCl is completely soluble in aqueo