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

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

In which one of the following reactions, the maximum quantity of H₂ gas is produced by the decomposition of 1 g of compound by H₂O/O₂?

Which one of the following compounds is used in 'black and white' photography?

Which one of the following materials is present in a guard tube (drying tube) that is used for preparation of HCl gas?

When limestone (calcium carbonate, CaCO₃) is heated strongly, it decomposes to form quicklime (calcium oxide, CaO) and carbon dioxide gas (CO₂). This reaction is an example of: