What are the substances added to a catalyst to increase its efficiency called?

Which of the following statements is incorrect?

$(a)$ List two differences between calcination and roasting in tabular form.
$(b)$ Which method will you use to reduce the following? Explain by giving a suitable example.
$(i)$ Oxides of less reactive metals.
$(ii)$ Oxides of moderately reactive metals.
$(iii)$ Oxides of highly reactive metals.

Which metal catches fire when kept exposed to air?

Why is iron galvanised with zinc? Can it be galvanised with copper? If not,why?

$Al_{2}O_{3(s)} + 2NaOH_{(aq)} \xrightarrow{\Delta} \dots + H_{2}O_{(l)}$