Which of the following statement(s) is/are true?

Titan yellow solution gives red colouration with a neutral solution containing ${\mathrm{Mg}}^{2+}$ ions.

Solution of nitrite is decomposed by sulphamic acid.

${{\mathrm{Fe}}^2}^{+}$ ions give brown colour precipitate with ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$ ions solution.

Green precipitate of$\mathrm{Cr}{\left(\mathrm{OH}\right)}_3$ is soluble in ${\mathrm{Na}}_2{\mathrm{O}}_2$.