One of the important uses of ferrous sulphate is in the

Which compound of zinc is white in the cold state and turns yellow in the hot state?

The oxoanion in which the oxidation state of the central atom is same as its group number in the periodic table is

Thermal decomposition of a $Mn$ compound $(X)$ at $513 \ K$ results in compound $Y$,$MnO_2$ and a gaseous product. $MnO_2$ reacts with $NaCl$ and concentrated $H_2SO_4$ to give a pungent gas $Z$. Identify $X, Y$ and $Z$.

Which of the following is a product of the first step and is used as a reactant in the next step for the manufacture of $K_{2}Cr_{2}O_{7}$ from concentrated chromite ore?

Which of the following is used for making railway tracks?