Manganese belongs to group number 7 and its oxidation state in MnO₄ ⁻/KMnO₄ is also +7 i.e., KMnO4 1 + x + 4 (-2) = 0 ⇒ 1 + x – 8 = 0 ⇒ x = 7 Hence, the formula of the oxo-anion is KMnO4.
As the half-life is independent of the initial concentration of the reactants. Hence, it is a first-order Reaction. The formula for the half-life of the first-order reaction. t½= 0.693/K
(i) Those properties which depends on a number of moles of solute irrespective of their Nature are called colligative properties. (ii) Molality is defined as the number of moles of solute dissolved per kg of the solvent. It is independent of temperature. Molality= Number of moles of solute/Mass of solvent in Kg