SSLC (English Medium) कक्षा ८ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Carbon dioxide gas is ______ in nature.

______ gas is essential for the proper growth of all plants.

______ exists in nature as silicates, carbonates, oxides, and water. It also exists in a free state as part of the air in the atmosphere.

Metals like magnesium, iron, and sodium burn in oxygen and give basic ______.

______ is used as a substitute for compressed air in tyres.

Oxygen is used to oxidize ______.

Match the following

Match the following

Nitrogen is about two times more soluble in water than oxygen.

Nitrogen is an essential element present in proteins and nucleic acids which are the building blocks of living things.

The solid form of CO₂ is called dry ice which undergoes condensation.

Nitrogen gas is so cold that moisture in the air condenses on it, creating a dense fog.

Assertion: Carbon dioxide occurs as carbonates in nature.
Reason: Carbon dioxide can exist as a liquid at atmospheric pressure.

Write the reaction of carbon dioxide with lime water.

Microplastics can be found in almost every freshwater source.

How do plastic sheets affect the soil?

Explain about oil spills.

Write a note on biodiesel.

Blue Cross of India was established in ______ in India. 

What are the functions of CPCSEA?