Burning of wood and coal causes_______ of air.

Academic Chemistry NCERT Class 8

Burning of wood and coal causes pollution of air.

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Updated on: 10-Oct-2022

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What type of combustion is represented by:(a) burning of white phosphorus in air at room temperature?(b) burning of LPG in a gas stove?(c) ignition of a cracker?(d) burning of coal dust in a coal mine?
Fill in the blanks.(a) Burning of wood and coal causes _____ of air.(b) A liquid fuel, used in homes is ______(c) Fuel must be heated to its ______ before it starts burning.(d) Fire produced by oil cannot be controlled by ______
What are the disadvantage of burning wood as fuel?
What happens when coal is heated in air? State the uses of coal.
Which of the following are chemical changes?(i) decaying of wood(ii) burning of wood(iii) sawing of wood(iv) hammering of a nail into wood(a) (i) and (ii) (b) (ii) and (iii)(c) (iii) and (iv) (d) (i) and (iv)
Why is water poured to extinguish burning wood?
Coal is said to be formed from the wood of trees. Why then is coal considered to be a non-renewable source of energy whereas wood is a renewable source of energy?
What is the impact of burning fuels in the air?
The _______ of coal produces coke, coal tar and coal gas
(a) What is a flame? What type of substance, on burning, give a flame?(b) What is the difference between the burning of a candle and the burning of a fuel like coal.
Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Which of the following are physical changes and which are chemical changes ?Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Which of the following produces more heat (per unit mass) on burning?Coal or LPG
How will you show that air supports burning?
Fill in the blanks with suitable words:(a) A fuel must be heated to its……… before it starts burning.(b) The most common supporter of combustion around us is……………..(c) Fire produced by burning oil cannot be controlled by…………………….(d) A liquid fuel used in homes is………(e) The amount of heat evolved when 1kg of a fuel is burnt completely is called its…………………..(f) The substance which vaporize during, give…………………..(g) Burning of wood and coal causes……………. of air.

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