Write two applications of electrolysis in which the anode diminishes in mass.

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Solution

(i) It is used for the electroplating of metals.

(ii) It is also used in purification of metals.

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Q. In which of the following electrolysis reactions

H_{2}

is given off only at anode?

Q. Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.
(c) Write two applications of electrolysis in which the anode diminishes in mass.
(d) If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the _________ and Y at the __________ of the electrolytic cell. (Provide the missing words).

(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).

Write the products of electrolysis at anode and cathode for electrolysis of aqueous NaCl?

Q. The following questions refer to the electrolysis of copper sulphate solution with copper electrodes:
(a) Compare the change in mass of the anode.
(b) What is seen to happen to the colour of the copper sulphate solution if platinum electrodes are used? Explain this observation.
(c) What is the practical application of the electrolysis of copper sulphate solution? Briefly, describe one such application.

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Write two applications of electrolysis in which the anode diminishes in mass.

(i) It is used for the electroplating of metals. (ii) It is also used in purification of metals.

(i) It is used for the electroplating of metals.

(ii) It is also used in purification of metals.