SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Airborne diseases are caused by fungi.

Differentiate Parasites and Saprophytes.

The atmospheric carbon dioxide enters the plants through the process of photosynthesis to form ______.

Carbon dioxide is also returned to the atmosphere through the ______.

Charcoal, diamond, and graphite are ______ forms of carbon.

All living organisms are made up of carbon-containing molecules like ______ and______.

During respiration, plants and animals release carbon into the atmosphere in the form of carbon monoxide.

Assertion (A): By increasing the amount of carbon dioxide, the earth becomes warmer.
Reason (R): Carbon dioxide is a greenhouse gas.

What are the effects of carbon dioxide in the atmosphere?

How is carbon dioxide returned to the atmosphere? 

You can see your image in polished floors, but not in wooden table because ______.

Clouds float in atmosphere because of their low ______.

What is meant by atmospheric pressure?

We can create enlarged, virtual images with ______.

State whether true or false. If false, correct the statement.

A compound cannot be broken into simpler substances chemically.

State whether true or false. If false, correct the statement.

Aspirin is composed of 60% Carbon, 4.5% Hydrogen and 35.5% Oxygen by mass. Aspirin is a mixture.

Write down the names of the particles represented by the following symbols and explain the meaning of superscript and subscript numbers attached.

`""_1"H"^1`, `""_0"n"^1`,`""_(-1)"e"^0`

Considering MgCl₂ as ionic compound and CH₄ as covalent compound give any two differences between these two compounds.

List two differences between the properties exhibited by covalent compounds and ionic compounds.

Give an example for each of the following statement

A compound in which two Covalent bonds are formed.