Which of the following ores is in the form of oxide?

Which of the following metals is a poor conductor of heat and electricity?

What is an alloy called if one of the metals is $Mercury$?

Which method/process is used to prepare sulphuric acid?

$A$ metal $M$ does not liberate hydrogen from acids but reacts with oxygen to give a black coloured product. Identify $M$ and the black coloured product,and also explain the reaction of $M$ with oxygen.

Dolomite is an ore of which metal?