MEDIUM
Earn 100

Explain the process of rusting and how could it be prevented.

Important Questions on Physical and Chemical Changes

MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
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 
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What is corrosion? 
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why do we apply paint on iron articles?
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why do we apply paint on iron articles?
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What happens when steam is passed over red-hot iron. Write only chemical equation.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

Give reasons-

Why copper is used to make hot water tanks and not steel (an alloy of iron)?

HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What is the action of water on magnesium? Write equations of the chemical reactions involved.
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why is rusting of iron considered a chemical change?
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Describe tinning of iron sheets.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Which of the following is/are stored in kerosene?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Explain how painting of an iron gate prevents it from rusting.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Give reason of Water pipes burst in severe winter.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Give reasons: Sodium, potassium and lithium are stored under oil.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why does aluminium not react with water under ordinary conditions?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Give the chemical name of the rust.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why is sodium and potassium stored in kerosene?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Sodium metal reacts vigorously with water.
Name the gas evolved when sodium reacts with water.
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Explain why rusting of iron objects is faster in coastal areas than in deserts.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Give a reason for the following:
Sodium and potassium are stored in kerosene.
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Sodium metal reacts vigorously with water.
State whether the Solution formed by the reaction of sodium with water is acidic or basic.