Question

Very Short-Answer Questions:
1. What are the substances which burn in air called?
2. What is the lowest temperature at which a substance catches the fire called?
3. Fossil fuels when burnt in limited supply of air produces a poisonous gas. Name the gas
4. Which one of a candle flame is the hottest?
Short-Answer Questions
1. State any two conditions necessary for combustion
2. What is meant by luminous and non-luminous flames?
3. Name to damaging effects of burning of coal and petroleum.​

Answer 1

Answer

Explanation:

This answers most of the questions

The substances which burn in air are called combustible. During the process of combustion, heat and light are given out. Ignition temperature is the lowest temperature at which a combustible substance catches fire.

Answer 2

Answer:

1.combustible,2. Ignition temperature,3.o oxygen,carbon and hydrogen,