Match the following: Group-A Group-B (i) Corrosion (a) Lanthanides (ii) Gold sol (b) Used in treatment of cancer (iii) Radon (c) Purple of cassius (iv) f-block elements (d) Barbituric acid (v) Tranquilizers (e) Hydrated ferric oxide.

(i)-(e), (ii)-(c), (iii)-(b), (iv)-(a), (v)-(d)

(i)-(d), (ii)-(c), (iii)-(b), (iv)-(a), (v)-(e)

(i)-(e), (ii)-(b), (iii)-(c), (iv)-(a), (v)-(d)

(i)-(e), (ii)-(a), (iii)-(b), (iv)-(c), (v)-(d)

HARD

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What do you mean by corrosion? How can you prevent it?

Important Questions on Electrochemistry

EASY

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Identify the correct statement:

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Write a short note on Alloying.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Explain, why:
Silver articles become black after some time when exposed to air.

HARD

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Match the following:

Group-A	Group-B
(i) Corrosion	(a) Lanthanides
(ii) Gold sol	(b) Used in treatment of cancer
(iii) Radon	(c) Purple of cassius
(iv) f-block elements	(d) Barbituric acid
(v) Tranquilizers	(e) Hydrated ferric oxide.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the products formed.

HARD

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

What is corrosion? Explain its mechanism and write any two measures of its prevention.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Which of the following methods is, suitable for preventing an iron frying pan from rusting?

HARD

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

With the help of a labelled diagram prove by an experiment that both oxygen/air and water necessary for rusting of iron.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

What is anodising? Give its applications.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Zinc or aluminium do not corrode because _____.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Rameshbhai said "when surface of any metal comes in contact with air, water, or humidity, corrosion will start". For this Divya, Darshana and Jigne gave certain statements.

Divya: When the paint is applied to the surface of iron, corrosion will start.

Darshana: In a test tube, iron is put in such a manner that half portion of iron sinks in water, then corrosion will start.

JIgne: When the surface of aluminium is kept open in the air, there will be no corrosion.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Why do we apply paint on iron articles?

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Corrosion is an electrochemical phenomenon. Explain.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Galvanization is applying a coating of: