Ignition Temperature

Q.

What is an ignition test in Chemistry?

Q.

Ignition temperature is the lowest temperature at which a substance catches fire. Identify the correct option regarding the ignition temperature of a good fuel.

1. Ignition temperature should be below the room temperature.

2. Ignition temperature should be above the room temperature.

3. Ignition temperature should be less than 25°C.

4. Ignition temperature should be equal to the room temperature.

Q.

Give Reason: Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminum pipe does not.

Q.

What is the difference between the burning of a candle and the burning of a fuel like coal? [2 MARKS]

Q.

The minimum temperature to which a substance should be heated so that it starts burning is known as

1. ignition temperature.

2. burning temperature.

3. flash point.
4. melting point.

Q.

Name the process in which a large amount of heat and light is given out.

Q.

A fire propagates because during burning -

1. A portion of heat released is utilised to maintain the substance.

2. A portion of heat released is utilised to maintain the ignition temperature.

3. A portion of heat released is utilised to melt the substance.
4. A portion of heat released is utilised to vapourise the substance.

Q.

Kerosene burns more rapidly than coke because

1. it has got more oxygen in it than coke

2. it is a liquid hydrocarbon

3. it has a low ignition temperature

4. none of these

Q. Question 8
The substance expected to have the highest ignition temperature out of the following is

(a) Kerosene
(b) Petrol
(c) Coal
(d) Alcohol

Q. Which of the following substances does not contain acids in it?

1. Urine
2. Soap
3. Bleaching powder
4. Grapes

Q.

The temperature of the flame of a candle is above ignition temperature.

1. Flame

2. Heat

Q. ___ temperature is referred as the lowest temperature at which fuel catches fire.

Q.

If ignition temperature of a substance is lower than room temperature then it will undergo spontaneous combustion.

1. True
2. False

Q.

In a candle, the process of burning continues because -

1. the wax

2. the air around
3. the fire

4. the wick

Q. Kerosene oil catches fire at room temperature.

1. True
2. False

Q.

The ignition temperature of fuel A, B, C and D are given below.$$\begin{array}{cc}\text{Fuel}& \text{Ignition Temperature}\\ \text{A}& 5^{\circ }\text{C}\\ \text{B}& {17}^{\circ }\text{C}\\ \text{C}& {480}^{\circ }\text{C}\\ \text{D}& {60}^{\circ }\text{C}\end{array}$$Which of the following will undergo spontaneous combustion at room temperature?

1. Fuel A and B
2. Fuel B and C
3. Fuel A and D
4. Fuel C and D

Q. Question 4
Which of the following is not a combustible substance?

(a) Camphor
(b) Glass
(c) Straw
(d) Alcohol

Q.

The minimum temperature to which a substance should be heated so that it starts burning is known as _____.

1. ignition temperature

2. burning temperature

3. boiling point
4. melting point

Q. The ignition temperature of wood _________ in the presence of water.

1. increases
2. cannot be determined
3. decreases
4. remains same

Q. Identify the correct option regarding the ignition temperature of an ideal fuel.

1. Ignition temperature should be below room temperature.
2. Ignition temperature should be above room temperature.
3. Ignition temperature should be equal to room temperature.
4. Ignition temperature should be equal to ${100}^{\circ }$C.

Q.

Fuel must be heated to its ____________ before it starts burning.

Q. Choose the substance which has the lowest ignition temperature.

1. Coal
2. Diesel
3. Paper
4. Wood

Q.

The picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.

1. Case 2

2. Case 1

3. Both case 1 and case 2

4. The paper doesn't burn in both the cases.

Q. Assertion : We can boil water in a paper cup.
Reason : Ignition temperature of paper lowers due to water.

1. Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
2. Assertion is correct but Reason is incorrect.
3. Assertion is incorrect but Reason is correct.
4. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Q. _________ is defined as the lowest temperature at which a substance catches fire.

1. Fusion temperature
2. Saturation temperature
3. Ignition temperature
4. Boiling temperature