With reference to 'Ignition Temperature', consider the following statements: 1. Ignition temperature is the highest temperature a substance can withstand without burning. 2. A matchstick does not catch fire on its own at room temperature. 3. Kerosene oil has a lower ignition temperature than wood. Which of the statements given above is/are correct?

Correct Option The correct option is (c). Explanation Ignition temperature is defined as the lowest temperature at which a combustible substance catches fire and undergoes combustion. A substance cannot catch fire or burn as long as its temperature is lower than its ignition temperature. Statement-wise Analysis - Statement 1 is Incorrect: Ignition temperature is the minimum temperature required for a substance to catch fire, not the highest temperature it can withstand without burning. If a substance reaches this temperature in the presence of oxygen, combustion begins. - Statement 2 is Correct: The ignition temperature of a matchstick is higher than room temperature. Therefore, it does not catch fire on its own at room temperature. It requires heat generated by friction (rubbing against the side of the matchbox) to reach its ignition temperature. - Statement 3 is Correct: Kerosene oil catches fire more easily than wood because it has a lower ignition temperature. This is why kerosene is often used to help ignite wood or charcoal, which require more heat to reach their ignition point. Key Takeaway Ignition temperature is a critical threshold property; for combustion to occur, a substance must be heated to this specific minimum temperature in the presence of a supporter of combustion (oxygen).

With reference to 'Ignition Temperature',… - NCERT Class 8 Science MCQ

NCERT Class 8 Science — Chapter 2: Combustion and flame

mcqmedium

With reference to 'Ignition Temperature', consider the following statements:

Ignition temperature is the highest temperature a substance can withstand without burning.
A matchstick does not catch fire on its own at room temperature.
Kerosene oil has a lower ignition temperature than wood.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 8 · Page 4

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

Correct Option

The correct option is (c).

Explanation

Ignition temperature is defined as the lowest temperature at which a combustible substance catches fire and undergoes combustion. A substance cannot catch fire or burn as long as its temperature is lower than its ignition temperature.

Statement-wise Analysis

Statement 1 is Incorrect: Ignition temperature is the minimum temperature required for a substance to catch fire, not the highest temperature it can withstand without burning. If a substance reaches this temperature in the presence of oxygen, combustion begins.
Statement 2 is Correct: The ignition temperature of a matchstick is higher than room temperature. Therefore, it does not catch fire on its own at room temperature. It requires heat generated by friction (rubbing against the side of the matchbox) to reach its ignition temperature.
Statement 3 is Correct: Kerosene oil catches fire more easily than wood because it has a lower ignition temperature. This is why kerosene is often used to help ignite wood or charcoal, which require more heat to reach their ignition point.

Key Takeaway

Ignition temperature is a critical threshold property; for combustion to occur, a substance must be heated to this specific minimum temperature in the presence of a supporter of combustion (oxygen).

Your note

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