(NH4)2Fe(SO4)2⋅6H2O(\text{NH}_4)_2\text{Fe}(\text{SO}_4)_2 \cdot 6\text{H}_2\text{O}(NH4)2Fe(SO4)2⋅6H2O is a hydrated double salt.
A student analyses this double salt using test tube tests.
Which row(s) gives/give correct result(s) for the stated test?
| Test | Results | |
|---|---|---|
| 1 | Reaction with cold NaOH(aq)\text{NaOH(aq)}NaOH(aq) | Brown precipitate |
| 2 | Reaction with acidified Ba(NO3)2(aq)\text{Ba(NO}_3)_2\text{(aq)}Ba(NO3)2(aq) | White precipitate |
| 3 | Reaction with warm NaOH(aq)\text{NaOH(aq)}NaOH(aq) | Green precipitate and a gas that turns damp red litmus paper blue |
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1