Oxygen

Q.

Assertion: Corrosion of iron is commonly known as rusting.

Reason: Corrosion of iron occurs in the presence of moist air.

1. Both assertion and reason are false.

2. Assertion is true, but the reason is false.

3. Both assertion and reason are true. The reason is the correct explanation of assertion.

4. Both assertion and reason are true. The reason is not the correct explanation of assertion.

Q.

An element having configuration $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}4{\mathrm{s}}^1$ will form:

1. Acidic oxide

2. Amphoteric oxide

3. Basic oxide

4. None of these

Q.

Hydrated ferric oxide is called _________ .

Q. Identify the gas which is - odourless, colourless and supports combustion.

1. Carbon dioxide
2. Oxygen
3. Nitrogen
4. Argon

Q.

Classify the following into metals and non-metals:

Copper, iron, graphite, sulphur, aluminium, oxygen

Q. During corrosion, iron reacts with which of the following substances that are present in the atmosphere?

1. Oxygen
2. Moisture
3. Nitrogen
4. Carbon dioxide

Q. Why does the oxygen in the atmosphere does not exhaust?

1. There is enough oxygen for all the organisms.
2. Balance of oxygen and carbon dioxide by plants and animals.
3. Not all organisms consume oxygen.
4. Carbon dioxide released by living organisms reacts with air to produce oxygen.

Q.

The process of burning a substance in the presence of oxygen is called ___.

Q. Which of the following metals can displace the other two metals from their salt solutions? ​
zinc, iron, copper

Q. Oxygen can be detected by its pungent odour.

1. True
2. False

Q.

Answer in one word:

A process in which oxygen is released by leaves.

Q.

Is corroded metal dangerous?

1. True
2. False

Q.

Classify the following into metals and non-metals:

Copper, iron, graphite, sulphur, aluminium, oxygen

Q.

Sometimes, when a person is caught with fire, a thick blanket is wrapped around him or her. This is done to

1. cut off the oxygen supply.

2. cut off the nitrogen supply.

3. keep the body cool.

4. cut off the inert gases supply.

Q. What is the slow process in which vegetable matter can be converted into carbon rich substances?

1. Carbonization
2. Destructive distillation
3. Polymerization
4. Adsorption

Q. What is the slow process in which vegetable matter can be converted into carbon rich substances?

1. Carbonization
2. Adsorption
3. Polymerization
4. Destructive distillation

Q. What is the slow process in which vegetable matter can be converted into carbon rich substances?

Q.

A. Fill in the blank spaces by choosing the correct words from the given list.

List : Suphurous, nitric acid, slowly, oxygen, phosphoric

4. Rusting takes place ___________.