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Introduction to Acids and Bases

Give reason a...

Question

Give reason as to why-the electrolysis of acidulated water is considered to be an example of catalysis.

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Solution

As pure water does not contain ions, sulphuric acid is added to it to generate ions, so that the electrolysis of water can take place. Sulphuric acid acts as a catalyst, as it increases the rate of reaction without being involved in the reaction. The net change in the mass of sulphuric acid utilised in the electrolysis is nil. Thus, electrolysis of acidulated water is considered as an example of catalysis.

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Q. Electrolysis of acidulated water is considred to be an example of catalysis.

Q. With reference to the electrolysis of acidulated water, answer the following:
(a) Why distill water is a non-electrolyte?
(b) What is the electrolytic cell called?
(c) State what you would observe at the (i) cathode (ii) anode.
(d) Summarize the electrode reactions.
(e) Why is the electrolysis of acidulated water considered as an example of catalysis?

(a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis.

(b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode

(i) State what you observe at the cathode and at the anode

(ii) State the change noticed in the electrolyte

(iii) Write the reactions at the cathode and at the anode.

(c) Differentiate between electrical conductivity of --- copper sulphate solution and of copper metal.

Q. Assertion :The electrolysis of acidified water is considered to be an example of catalysis. Reason: An addition of acid like sulphuric acid makes it an electrolyte. In the presence of

H^{+}

S O_{4}^{- 2}

, water becomes capable of dissociation. Sulphuric acid does not take part in the reaction but promotes the reaction or increases the rate of the reaction.

Q. Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
a. To prevent rusting, a layer of ........ metal is applied on iron sheets.
b. The conversion of ferrous sulphate to ferric sulphate is ........ reaction.
c. When electric current is passed through acidulated water ........ of water takes place.
d. Addition of an aqueous solution of ZnSO₄ to an aqueous solution of BaCl₂ is an example of ....... reaction.

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