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Why are several blocks of magnesium fixed to the bottom of a ship?

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Important Questions on Electrochemistry

EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Define the corrosion of metals.
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
What is sacrificial protection?
HARD
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Define corrosion. Write two preventions from corrosion.
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Identify the correct statement:
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Out of zinc and tin, whose coating is better to protect iron objects?
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of 
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Rusting of iron is said to be an electrochemical phenomenon. Give reason for this.
MEDIUM
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Corrosion is an electrochemical phenomenon. Explain.
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Write two conditions necessary for the corrosion to occur. 
HARD
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention

Define the term: Corrosion
Write two applications of electrochernical series.

EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Galvanization is applying a coating of:
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.

 

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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
Iron scraps are advisable and advantageous than zinc scraps for reducing the low grade copper ores. Why?
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
The iron nail dipped in Copper sulphate solution becomes brown and the blue colour of the Copper sulphate solution fades. Which type of reaction is this?
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
What is corrosion? Explain two factors which affect corrosion.
HARD
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Iron gets rust, but Gold doesn’t, why?
HARD
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
To protect iron against corrosion the most durable metal plating on it is?
EASY
Chemistry>Physical Chemistry>Electrochemistry>Corrosion and its Prevention
Blocks of magnesium are fixed to the bottom of a ship to