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

During the extraction of iron from hematite in a blast furnace,which substance is obtained as slag?

Which process is used to determine the reactivity of a metal?

Account for the following:
$(a)$ Aluminium is more reactive than iron,but its corrosion is less than iron.
$(b)$ Hydrogen gas is not evolved when zinc metal reacts with dilute $HNO_3$.
$(c)$ Carbon is not used for reducing aluminium from aluminium oxide.

Non-metals form two types of oxides. Choose these two types from the following oxides:
$SO_2, NO_2, CO, H_2O, N_2O$

Which gas has a pungent smell that causes choking and coughing?