$A$ pink colored salt on dry heating becomes blue in colour. The salt may contain:

$A$ red coloured mixed oxide $(X)$ on treatment with conc. $HNO_3$ gives a compound $(Y).$ $(Y)$ with $HCl$ produces a chloride compound $(Z)$ which can also be produced by treating $(X)$ with conc. $HCl.$ Compounds $(X),$ $(Y),$ and $(Z)$ will be

Which of the following reactions is incorrect regarding the hydrolysis of metal carbides?

Nitrates of all metals are:

Slow acting nitrogenous fertilizer among the following is

Which of the following alloys is used for filling dental cavities?