Which of the following non-metals is a liquid?

In which of the following,is a displacement reaction possible?

Brass is an alloy of

What is the molecular formula of sodium aluminate?

$(i)$ Name a metal which does not stick to glass.
$(ii)$ Name the metal which is commonly used in thermite welding.
$(iii)$ What is the nature of zinc oxide?

State whether the following statement is true or false:
$A$ solution of an ionic compound in water contains ions,which move to the opposite electrodes when electricity is passed through the solution.