SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions

What is a chemical equation?

Write the skeleton equation for the following word equation and then balance them.

1. Carbon + Oxygen → Carbon dioxide.
2. Phosphorus + Chlorine → Phosphorus pentachloride.
3. Sulphur + Oxygen → Sulphur dioxide.
4. Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride.

Balance the following chemical equation.

1. Na + O₂ → Na₂O₃
2. Ca + N₂ → Ca₃N₂
3. N₂ + H₂ →NH₃
4. CaCO₃ +HCl → CaCl₂ + CO₂ +H₂O
5. Pb(NO₃)₂ → PbO + NO₂ + O₂

Match the following.

What is bio-indicator? How does it help human beings?

What is a reactant in a chemical equation?

What is a product in a chemical equation?

What are the steps involved in writing the skeletal equation?

Lichen is a natural ______.

______ is a bio-predator.

______ centers serve as the ultimate link between ICAR and farmers.

Several popular high-yielding varieties of major crops have been developed by ______.

Give a brief account on Krishi Vigyan Kendra.

The equation Na + H₂O → NaOH + H₂ is ______.

Mention any two information conveyed by a balanced chemical equation.

What are the points to be followed while balancing a chemical equation?

What information is not conveyed by a balanced chemical equation?

______ is commonly known as the Pusa Institute.

The first KVK was established in 1974 at ______.

What is foliar spray?