MEDIUM
Earn 100

Corrosion is essentially an electrochemical phenomenon. Explain the reactions occurring during corrosion of iron kept in an open atmosphere.

Important Questions on Electrochemistry

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
Which of the following methods is, suitable for preventing an iron frying pan from rusting? 
HARD
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
What is corrosion? Explain its mechanism and write any two measures of its prevention.
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Why do we apply paints on iron goods?
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
What is anodising? Give its applications. 
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Corrosion is an electrochemical phenomenon. Explain.
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
Define corrosion. Write two preventions from corrosion.
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Zinc or aluminium do not corrode because _____.
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Write any three measures to prevent 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.
HARD
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
Write three methods to prevent rusting of iron.
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.

 

 

 

MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
What is corrosion? Explain two factors which affect corrosion.
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Silver articles become black on prolonged exposure to air. This is due to the formation of 
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Write the precautions to be taken in the experiment to show air and water are essential for rusting iron articles, and also write the experimental procedure.
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Write a short note on Alloying. 
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.
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and Its Prevention
Why do we apply paint on iron articles?