_____ gas turns lime water milky.

रिक्त स्थान भरें

Carbon-di-oxide gas turns lime water milky.

shaalaa.com

क्या इस प्रश्न या उत्तर में कोई त्रुटि है?

अध्याय 4: Air - Evaluation [पृष्ठ ५५]

अध्याय 4 Air
Evaluation | Q II. 5. | पृष्ठ ५५

Name and briefly explain four ways by which pollution of air caused by humans is minimised.

What are fuels?

Write ‘true’ or ‘false for the following;

The composition of air was discovered by Lavoisier.

State the utility of oxygen for respiration in living organisms

The diagrams below represents an experiment to show the presence of a component of air.

State why air is sucked from – outlet ‘B’ and not from outlet “A”
State why the air is sucked ‘slowly’ from the outlet “B”
State the observation seen after completion of the experiment.
State the reason for the above observation seen.
Name another component which if present in air as a pollutant would have given a similar observation

What is the percentage of oxygen in air?

Match the following

Arrange the following statements in correct sequence

Plants manufacture food by a process called photosynthesis.
Plants require energy for their growth.
Plants take in oxygen and release carbon dioxide just as animals.
Plants take carbon dioxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
Such oxygen is available to animals and human beings for breathing.
During this process, oxygen is released by plants.

How will you prove that air supports burning?

Explain carbon dioxide and its uses.