During which reaction is dihydrogen gas not produced under normal conditions?

What is the chemical formula of nitric acid?

What is the melting point of alumina $(Al_2O_3)$ (in $;K$)?

Of the three metals $X, Y$ and $Z$,$X$ reacts with cold water,$Y$ with hot water,and $Z$ with steam only. Identify $X, Y$ and $Z$ and also arrange them in the order of increasing reactivity.

$(a)$ Consider the following chemical equation:
$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$
Name two categories in which you can place this reaction.
$(b)$ Define the term 'Oxidation' of a substance and name the substance oxidised and the oxidising agent in the above reaction.

State whether the following statement is true or false:
Copper reacts vigorously with dilute $HCl$.