Chemistry - Salt Analysis Question with Solution | TestHub

Calculate the number of reactions with correct observations from the following:

(1) ${\mathrm{H}}_3{\mathrm{AsO}}_4+({\mathrm{NH}}_4{)}_2{\mathrm{MoO}}_4+{\mathrm{HNO}}_3$ (conc.) $\to$ Yellow precipitate

(2) $\mathrm{Cu}(\mathrm{OH}{)}_2\cdot {\mathrm{CuSO}}_4+{\mathrm{NH}}_4\mathrm{OH}$ (Excess) $\to$ Blue solution

(3) ${\mathrm{FeCl}}_3$ (neutral) $+{\mathrm{CH}}_3\mathrm{COONa}\stackrel{\Delta }{\to }$ Brown Red Precipitate

(4) ${\mathrm{Ag}}_2{\mathrm{SO}}_3(\mathrm{s})$ (white) $\underset{\text{ Water }}{\overset{\text{ Boiling }}{\to }}$ Black Residue $\stackrel{{\mathrm{NH}}_3}{\to }$ clear soluble

(5) ${\mathrm{AgI}}_{(s)}\stackrel{\text{ Boiling }}{\to }$ clear solution

(6) $\mathrm{Hg}({\mathrm{NO}}_3{)}_2\underset{\text{ Excess }}{\overset{\mathrm{KI}}{\to }}$ clear solution

(7) ${\mathrm{NaNO}}_3\stackrel{Heating}{\to }$ Brown fumes

(8) ${\mathrm{FeCl}}_3+{\mathrm{K}}_3\mathrm{Fe}(\mathrm{CN}{)}_6\to$ Brown precipitate

(9) ${\mathrm{PbSO}}_3\underset{\text{ in Air }}{\overset{\Delta }{\to }}$ Black Precipitate