Properties of Oxygen

Q.

What chemicals smell like rotten eggs?

Q.

A boy adds hot water in an aquarium to make the water warm. What could have happened to the fish in the aquarium, after a while?

1. Fish will reproduce easily.

2. All the fish will die.

3. Warmer water will make the fish more comfortable.

4. Warm water will help in the quick movement of the fish in the aquarium.

Q.

Which element is essential for burning of fuel?

1. Carbon dioxide

2. Sulphur dioxide

3. Nitrogen

4. Oxygen

Q.

The gas which is used in rockets as oxidizer is:

1. Liquid hydrogen

2. Liquid oxygen

3. Liquid nitrogen

4. Liquid carbon dioxide

Q. Which of the following are neutral oxides?

1. $\text{CO}$
2. $\text{NO}$
3. ${\text{N}}_2\text{O}$
4. $\text{MgO}$

Q.

Fish do not always grow as well in warm as in cold water, why?

Q.

The major use of oxygen is breathing and supporting life apart from that it is used for which purpose?

1. Rocket Fuel

2. Fuel cell

3. Metal and Steel Industries

4. Combustion

Q. Which among the following is released when potassium chlorate is heated in the laboratory?

1. Potassium permanganate
2. Potassium chloride
3. Oxygen
4. Hydrogen

Q.

What are the importance of dissolved gases present in water?

Q.

39 The gas Y is colorless and odorless having a slightly sour taste and is a minor component of air. It is moderately soluble in water. The gas is neither burns not supports burning. It rather extinguishes a burning fire. If there were no gas Y in air, there would be no animals or plants on the earth.

(a) Identify gas Y.

(b) In what percentage, gas Y present in the air?

(c) State two ways in which gas Y is added to the air.

(d) Gas Y is necessary for the existence of life. Why?

Q.

Write three physical properties of hydrogen.

Q.

The statements given below are incorrect. Write the correct statements.

LOX is used for burning fuel in welding torches

Q.

Which of the following gas burns with a pop sound?

1. Nitrogen

2. Fluorine

3. Hydrogen

4. Oxygen

Q.

The lack of which of the following constituents of air forces us to gasp and struggle to breathe?

1. Nitrogen

2. Oxygen

3. Carbon dioxide

4. Water vapour

Q. Choose the correct statement(s).

1. Hydrogen is used in the oxyhydrogen torch.
2. Hydrogen is used in rocket fuels.
3. Hydrogen is used in Haber's process for the manufacturing of ammonia.
4. None of these.

Q. When you tilt a burning candle, the flame will

1. Tilt to the side
2. Stay upright
3. Either stay upright or tilt to the side
4. The flame will go off

Q. How is sodium chloride different from its constituent elements?

Q. What is the reason behind compressibility of gases?

Q. Which of the following oxides is/are not acidic in nature?

1. $Cl{O}_2$
2. $C{l}_{2}O$
3. $N_{2}O$
4. $N{O}_2$