(a) Determine the oxidation number of manganese in MnO\(_4\) (b)(i) List two metals that are extracted from their ores by electrolysis (ii) Give one difference between a conductor and an electrolyte.
Explanation
(a) X + (4X - 2) = -1 X - 8 = -1 X = +8 - 1 = +7 (b)(i) Aluminium or calcium or sodium or potassium or magnesium. (ii)
Conductors
Electrolytes
(1) They are not decomposed by electric current Decomposed by the passage of current.(2) They are usually solids (3) Free electrons conduct the current
Decomposed by the passage of currentThey are molten or aqueous solutionMobile ions conduct the current.
