Which of the following pairs will give displacement reactions?

Which metal burns with a dazzling white light when heated at a high temperature?

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

Brass is an alloy of

Write the names and symbols of the constituents present in the following alloys:
$(a)$ Brass
$(b)$ Bronze
$(c)$ Solder

Explain the following statements:
$(a)$ Most metal oxides are insoluble in water but some of these dissolve in water. What are these oxides and their solutions in water called?
$(b)$ At ordinary temperature,the surfaces of metals such as magnesium,aluminium,and zinc are covered with a thin layer. What is the composition of this layer? State its importance.
$(c)$ Some alkali metals can be cut with a knife.