Which of the following does not dissolve in dil $H_2SO_4$?

Which of the following is $NOT$ obtained when metal carbides react with $H_2O$?

$A$ white solid '$A$' on heating produces a gas that turns lime water milky,and the remaining solid residue is yellow when hot but turns white on cooling. The solid '$A$' is:

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

Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics :
$(a)$ Tendency to form ionic/covalent compounds.
$(b)$ Nature of oxides and their solubility in water.
$(c)$ Formation of oxosalts.
$(d)$ Solubility of oxosalts.
$(e)$ Thermal stability of oxosalts.

The initial setting of cement is primarily due to which of the following?