Write the names and formulae of the hydrides of oxygen.

Write the names and formulae of main ores of Fe , Cu , Al and Zn .

Write the name and formula of the next homologue of methanoic acid. What is its common name?

Write the name and formula of an ore of aluminium.

Write the name and formula of main ores of Fe, Cu,Al and Zn.

Write the names and structural formulae of the following: a saturated hydrocarbon

Write the names and structural formulae of the following: an unsaturated hydrocarbon with a double bond

Name the allotropes of oxygen.

Write the names and formulae of mono-, di- and triprotic acids.

Write the name and formula of a species other than NH_4^+ which involves simple covalent bonds and a coordinate bond.

Name or state with reference to the elements of the modern periodic table. The formula of the hydride of the halogen in period 3.