Which elements are found in the second and third positions in the Earth's crust,respectively?

Select the correct option using $T$ (true) or $F$ (false) for the following statements:
$(1)$ Calamine and Siderite are carbonate ores.
$(2)$ Zinc blende and Pyrite are sulphide ores.
$(3)$ Haematite and Magnetite are hydroxide ores.
$(4)$ Malachite and Cuprite are copper ores.

What are the common ores of copper and zinc?

"Metals are usually not found as nitrates in their ores."
Out of the following two $(a)$ and $(b)$ reasons,which is/are true for the above observation?
$(a)$ Metal nitrates are highly unstable.
$(b)$ Metal nitrates are highly soluble in water.

Identify the correct pair of minerals and their formulas from the following.

The formula of magnetite is: