What products will be formed when calcium carbide reacts with nitrogen at $1000 \ ^oC$?

Which one of the following statements is not correct?

The catenation tendency of $C, Si$ and $Ge$ is in the order $Ge < Si < C$. The bond energies (in $kJ \ mol^{-1}$) of $C-C, Si-Si$ and $Ge-Ge$ bonds, respectively, are:

State True or False for the following statements:
$(1)$ Oxides of indium and thallium are basic in their properties.
$(2)$ $C$,$Si$ are non-metals,while germanium,tin,and lead are high melting metals.

$A$ large amount of energy is released during the formation of $Al_{2}O_{3}$,which is used in which of the following?

The gas produced by the passage of air over hot coke is