Tetraoxosulphate (VI) acid is considered as a heavy chemical because

How many isomers can be formed from a compound with molecular formula C\(_5\)H\(_{12}\) ?

The oxidation number of iron, in its free state is

Water pipes are produced from 

Consider the reaction represented by the following equation: 

x Al  +  yCl\(_2\) → z AlCl\(_3\)