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What are the sources of oxygen?

Important Questions on Know About Some Common Gases

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Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
What happens when a fuel is burnt? Give equation.
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Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Name three metals which are stored under kerosene.
MEDIUM
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen

Write the chemical equation for the following events.

Aluminium came in contact with air.

EASY
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
State reasons for the following: Sodium and potassium metals are kept immersed under kerosene oil.
HARD
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Give a brief account of the chemical properties of metals.
EASY
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Why is sodium kept immersed in kerosene oil?
MEDIUM
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Give the disadvantages of incomplete combustion.
HARD
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Why is sodium kept immersed in kerosene oil?
MEDIUM
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Why is sodium kept under kerosene?
HARD
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
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Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
How is oxygen and carbon dioxide transported in human beings?
HARD
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
How do different types of metal react with oxygen?
MEDIUM
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Why the rate of respiration is faster in aquatic animals than the terrestrial animals? 
EASY
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
EASY
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen

Write scientific reason.

Sodium is always kept in kerosene.

HARD
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
What happens when sodium and potassium reacts with oxygen? Explain with reaction.
EASY
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen

What is your observation in the following case:

Burning of magnesium in air.

HARD
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen

The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.

MEDIUM
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
MEDIUM
Science>Chemistry>Know About Some Common Gases>Occurrence and Importance of Oxygen
Name two elements that are stored in kerosene