261) Mass of H₂C₂O₄ required to reduce 100 mL of 0.008M KMnO₄ in acidix medium is x gm and to neutralize 100 mL of 0.01M Mg(OH)₂ is y gm, then the relation between x and y is:

262) The pH of 0.1M solution of the following, increases in the order:

263) What is [H⁺] in mol⁄L of a solution that is 0.2M in CH₃COONa and 0.1M in CH₃COOH? K_a for CH₃COOH = 1.8 x 10⁻⁵

264) In a buffer solution containing equal concentration of B⁻ and HB, the K_b for B⁻ is 10⁻¹⁰. The pH of buffer solution is:

265) Equal volumes of two solutions of NaOH, one having pH = 11 and the other having pH = 12, are mixed together. pH of the resultant solution will be: