EASY
Earn 100

List the conditions for corrosion to take place.

Important Questions on Changes - Physical and Chemical

EASY
Science>Chemistry>Changes - Physical and Chemical>Chemical change
 State two ways to prevent the rusting of iron.
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Explain how painting of an iron gate prevents it from rusting.
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Which property of iron is modified in stainless steel? What is done to do so?
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Iron rusts, whereas stainless steel which contains large quantity of iron does not. Explain.
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Prevention of rusting of iron by coating it with zinc. (Greasing / Galvanisation)
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Which metal is used to galvanise iron to protect it from rusting?
EASY
Science>Chemistry>Changes - Physical and Chemical>Chemical change
What is the chemical symbol for iron ? 
EASY
Science>Chemistry>Changes - Physical and Chemical>Chemical change
A coating of __________ is deposited on iron in bridges and automobiles to provide strength.
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
When a copper object is exposed to moist air for a long time, then a green coating is formed on its surface. What is the material of the green coating?
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Describe tinning of iron sheets.
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
A metal, when deposited on the surface of an iron object prevents its rusting. Identify the metal.
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Iron is usually galvanized with 
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
When a copper object is exposed to moist air for a long time, then a green coating is formed on its surface. State whether the green coating is acidic or basic.
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Iron is galvanized by coating it with
EASY
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Which of these is not true about chromium?
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Bathroom fittings are electroplated with _____ to prevent rusting. (iron/ chromium/ zinc)
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
A strip of impure copper metal is given to you. Describe briefly how you will purify it by using the chemical effect of electric current. Draw a labelled diagram of the experimental set up used for this purpose. 
HARD
Science>Chemistry>Changes - Physical and Chemical>Chemical change
Complete the following reaction:

2Cu+H2O+CO2+O2 →
EASY
Science>Chemistry>Changes - Physical and Chemical>Chemical change
_____________ plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.
MEDIUM
Science>Chemistry>Changes - Physical and Chemical>Chemical change
What happens when a copper vessel is exposed to moist air for a long time?