When tin is treated with concentrated nitric acid,what is the product formed?

When bauxite powder is mixed with coke and heated with nitrogen at $2075 \ K$,carbon monoxide and $x$ are formed. Which gas is produced when $x$ reacts with water?

In Haber's process,hydrogen is obtained by reacting methane with steam in the presence of $NiO$ as a catalyst. This process is known as steam reforming. Why is it necessary to remove $CO$ when ammonia is obtained by Haber's process?

Inertness of $N_2$ gas is due to

The $+1$ oxidation state in group $13$ and $+2$ oxidation state in group $14$ become more stable with increasing atomic number. Explain.

In some of the reactions,thallium resembles aluminium,whereas in others,it resembles group $1$ metals. Support this statement by giving some evidence.