1996 WAEC Chemistry Theory (a) Determine the oxidation number of manganese in MnO\(_4\) (b)(i) List two metals that are...

(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.

(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 current

They are molten or aqueous solution

Mobile ions conduct the current.

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