Which among the following is a mineral of copper?

Which of the following minerals does not contain $Al$?

The chief impurity present in red bauxite is:

Azurite is an ore of

Both iron and copper are present in which of the following ores?

Sulphide ion is a soft base and its ores are common for metals. Which of the following metals commonly occur as sulphide ores?
$(a)$ $Pb$ $(b)$ $Al$ $(c)$ $Ag$ $(d)$ $Mg$
Choose the correct answer from the options given below: