EASY
Earn 100

A gas obtained during the thermal decomposition of potassium permanganate is .

50% studentsanswered this correctly

Important Questions on Non-metals

MEDIUM
Science>Chemistry>Non-metals>Oxygen

Match the following:

  Column A   Column B
1. Oxygen a. Upper atmosphere
2. Carbon dioxide b. Factory chimneys
3. Water vapour c. Combustion
4. Smoke d. 0.03%
5. Ozone e. Humidity

 

EASY
Science>Chemistry>Non-metals>Oxygen

Explain why a burning candle stops burning after some time when covered with an inverted gas jar.

EASY
Science>Chemistry>Non-metals>Oxygen
Which of the following is necessary for burning things?
Argon, Carbon dioxide, Oxygen, Nitrogen, Helium
MEDIUM
Science>Chemistry>Non-metals>Oxygen
How do plants and animals maintain the balance of oxygen and carbon dioxide gases in air (or atmosphere)?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
Why are burrows and holes dug deep into the soil by the animals which live inside the soil?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
How do animals that live in the soil get oxygen for breathing (or respiration)?
EASY
Science>Chemistry>Non-metals>Oxygen
How do earthworms breathe?
HARD
Science>Chemistry>Non-metals>Oxygen

Study the picture and answer the questions.

Question Image

(i) Will the flame of the candle go out at once? Why or why not?

(ii) Will the water start boiling after some time? Why or why not?

(iii) Will the candle flame go out after some time? Why or why not?

(iv) If you hold the inverted glass jar so that it covers the candle flame but its rim is above the water level, what will happen?

MEDIUM
Science>Chemistry>Non-metals>Oxygen
Explain how the oxygen in the air (or atmosphere) is replaced.
MEDIUM
Science>Chemistry>Non-metals>Oxygen
How will you show that air (or oxygen) is necessary for burning?
HARD
Science>Chemistry>Non-metals>Oxygen
How will you show that:
(i) air is present in a lump of soil?
(ii) air is dissolved in water?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
Explain why, if the clothes of a person catch fire accidently, he is covered with a woollen blanket. Give reason for your answer.
MEDIUM
Science>Chemistry>Non-metals>Oxygen
Why do deep-sea divers carry oxygen cylinders with them?
HARD
Science>Chemistry>Non-metals>Oxygen
By a simple experiment, prove that air is essential for burning.
EASY
Science>Chemistry>Non-metals>Oxygen
Which component of air acts as a supporter of combustion?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
How do the roots of land plants get oxygen for respiration?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
Is air present in water and in the soil?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
How is the balance of oxygen and carbon dioxide maintained in the atmosphere?
EASY
Science>Chemistry>Non-metals>Oxygen
How do aquatic animals like fish (which live in water) get oxygen required for breathing?
MEDIUM
Science>Chemistry>Non-metals>Oxygen
Explain why, a burning coal fire stops burning after some time when covered with a vessel.