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

Which of the following compounds is/are used for oxygenating the submarine or spaceshuttle?

To distinguish between $A$ and $B$,it is observed that both elements form oxides,but $B$ also forms a nitride when burnt in air. What are $A$ and $B$?

$A$ 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

'Bordeaux mixture' is used as a fungicide. It is a mixture of

Which of the following are ionic carbides?