The metal used to recover copper from a solution of copper sulphate is

An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?

Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour ?

The number of moles of oxygen gas used in the complete combustion of 1 mole of glucose is :

Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (…

Vapours of sulphur escaping from a volcano often form a crust on the rocks. The process involved is an example of