Study the flow chart: mixture of gas F + gas H ⇌ ammonium salt G (cool/heat); G dissolves in water; with aqueous sodium hydroxide it gives gas H, which with aqueous copper(II) sulphate gives a deep blue solution; with acidified silver nitrate it gives white precipitate I. The letters F–I are not the chemical symbols for the substances.

1. aWhat is the name of gas H evolved in the reaction? [1]
2. bDescribe the colour change when a drop of Universal Indicator is added to a solution of gas H. [1]
3. cGive the name and formula of the cation present in salt G. [2]
4. dName the white precipitate I. [1]
5. eName the change which occurs when salt G is heated. [1]

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