Chemistry · Atoms and Molecules

Select the option that correctly matches the statements in Column 1 with those in Column 2. Column 1Column 2A. Elements combine in fixed ratios by massI. Dalton's atomic theoryB. Atoms are indivisible and indestructibleII. Equal number of entities (Avogadro's constant)C. Sulphate and oxalate ions are anions, while magnesium and ammonium ions are cationsIII. Law of constant proportionsD. One mole of any substance contains the same number of chemical unitsIV. Representation of chemical ions