MEDIUM
Earn 100

Explain the process of coating of copper on iron key. Draw the circuit diagram.

Important Questions on Chemical Effects of Electric Current

HARD
Science>Physics>Chemical Effects of Electric Current>Electroplating
What is corrosion? Explain its mechanism and write any two measures of its prevention.
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
Write a short note on Alloying. 
EASY
Science>Physics>Chemical Effects of Electric Current>Electroplating

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

MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
Corrosion is an electrochemical phenomenon. Explain.
EASY
Science>Physics>Chemical Effects of Electric Current>Electroplating
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.
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating

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
Science>Physics>Chemical Effects of Electric Current>Electroplating
Which of the following methods is, suitable for preventing an iron frying pan from rusting? 
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
What is corrosion? Explain two factors which affect corrosion.
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
What is anodising? Give its applications. 
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
Zinc or aluminium do not corrode because _____.
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
Why do we apply paints on iron goods?
EASY
Science>Physics>Chemical Effects of Electric Current>Electroplating
Why do we apply paint on iron articles?
HARD
Science>Physics>Chemical Effects of Electric Current>Electroplating
With the help of a labelled diagram prove by an experiment that both oxygen/air and water necessary for rusting of iron.
HARD
Science>Physics>Chemical Effects of Electric Current>Electroplating

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.

 

MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
Write three methods to prevent rusting of iron.
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
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.
HARD
Science>Physics>Chemical Effects of Electric Current>Electroplating
Define corrosion. Write two preventions from corrosion.
EASY
Science>Physics>Chemical Effects of Electric Current>Electroplating
Write any three measures to prevent rusting.
HARD
Science>Physics>Chemical Effects of Electric Current>Electroplating
Why do we apply paint on iron articles?
MEDIUM
Science>Physics>Chemical Effects of Electric Current>Electroplating
State Faraday's law of electrolysis.