$A$ mineral is usually associated with a large amount of unwanted material called

The region in which main metals are found in the Earth is called:

Which one of the following types of metals is expected to occur in the native state?

Argentite is an ore of which of the following?

The chief impurity present in red bauxite is:

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: