The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by

The decreasing order of the oxidising power of the halogens is

20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentratio...

Which element contains the greatest number of moles?

Animal charcoal differs from wood charcoal in that it

The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is

The position of an element in the Periodic Table is determined by

The use of sulphur to vulcanize rubber is mad to make it

Which statement BEST describes the process of oxidation?