(a) Copy and complete the following table which refers to two practical applications of electrolysis

$\begin{matrix} A n o d e & E l e c t r o l y t e & C a t h o d e (i) S i l v e r p l a t i n g & S o l u t i o n o f o f a s p o o n & p o t a s s i u m a r g e n t o c y a n i d e (i i) P u r i f i c a t i o n O f c o p p e r (i i i) E x t r a c t i o n O f s o d i u m \end{matrix}$

(b) Write equations of reactions taking place at anode for Q.2(a).

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Solution

(a)

Anode Electrolyte Cathode

Silver plating of spoon Plate of pure clean silver Solution of potassium argentocyanide Article to be electroplated

Purification of copper Impure copper Solution of copper sulphate and dilute sulphuric acid Thin strip of pure copper

Extraction of sodium Graphite rod Sodium chloride solution Ring of iron

(b)
$A g ⟶ A g^{+} + e^{-}$
$C u (s) - 2 e^{-} ⟶ C u^{2 +} (a q)$

$2 C l^{-} ⟶ C l_{2} + 2 e^{-} (O x i d a t i o n)$

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