EASY
Earn 100

In the presence of moisture and air, the iron gets converted into iron oxide. This process is called as  of iron.

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Important Questions on Changes Around Us

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

Give reasons-

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

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