Which of the following gas is used by Human beings and animals for breathing ?

Which of the following alloy is formed by the combination of Copper, Tin and Zinc ?

Metal oxides that are soluble in water dissolve in it to further form ______________________.
 

Brass is formed by the combination of Copper and _________________.

Which of the following is least reactive metal in each of the following ?

For corrosion of metals, there should be   _______________________

Which of the following are correct :

(a) Iron is used for making automobiles, machinery, pipes, containers, nails, etc.

(b) Zinc is mainly used as a protective coating for iron.

A non-metal used to preserve food stuffs is __________________

Iron is shiny gray initially but after some time forms the layer of hydrated Iron (III) oxide in the presence of  _____________________

Which of the following are correct :

(a) Magnesium and zinc do not displace copper from copper sulphate solution.

(b) Magnesium and zinc displace copper from copper sulphate solution.

(c) Aluminium and iron displace copper from solution of copper sulphate.