Observe the figure and answer the following: Name the label A to F.

The image shows the apparatus for the preparation of oxygen gas by the decomposition of hydrogen peroxide.

Observe the figure and answer the following: What is the role of A in this process?

The image shows the apparatus for the preparation of oxygen gas by the decomposition of hydrogen peroxide. A is a catalyst manganese dioxide. It is not used up in the reaction but increases the rate of the reaction. which means the catalyst A, speeds up the decomposition of hydrogen peroxide and liberates oxygen effectively.

Observe the figure and answer the following: Write the balanced reaction for the gas F being prepared.

The image shows the apparatus for the preparation of oxygen gas (F) by the decomposition of hydrogen peroxide. The balanced chemical reaction is as follows: 2 H 2 O 2 → MnO 2 2 H 2 O + O 2

E M B I B E

Innovative Chemistry>Chapter 8 - Air and Atmosphere>EVALUATE YOUR UNDERSTANDING>Q IV

HARD

7th ICSE

IMPORTANT

Earn 100

List the physical and chemical properties of nitrogen.

Important Questions on Air and Atmosphere

HARD

7th ICSE

IMPORTANT

Innovative Chemistry>Chapter 8 - Air and Atmosphere>EVALUATE YOUR UNDERSTANDING>Q 1

A glowing splinter rekindles when introduced in a jar of oxygen and a moist blue litmus paper shows no change when placed in a test tube containing oxygen gas. Give scientific reasons.

MEDIUM

7th ICSE

IMPORTANT

Innovative Chemistry>Chapter 8 - Air and Atmosphere>EVALUATE YOUR UNDERSTANDING>Q 2

Why oxygen is called active air?

HARD

7th ICSE

IMPORTANT

Innovative Chemistry>Chapter 8 - Air and Atmosphere>EVALUATE YOUR UNDERSTANDING>Q 3

Carbon dioxide plays no role in respiration but all life would come to an end if there were no carbon dioxide in the air. Support this statement with relevant facts.

HARD

7th ICSE

IMPORTANT

Innovative Chemistry>Chapter 8 - Air and Atmosphere>EVALUATE YOUR UNDERSTANDING>Q 1

Observe the figure and answer the following:

Question Image