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Question

Which of the following statement is not true?
  1. Flame can be seen over burning solids and liquids
  2. Type of flame depends upon the amount of oxygen available
  3. Invisible zone of a flame is the least hot zone
  4. Blue zone indicates complete combustion of fuel

A
Type of flame depends upon the amount of oxygen available
B
Flame can be seen over burning solids and liquids
C
Invisible zone of a flame is the least hot zone
D
Blue zone indicates complete combustion of fuel
Solution
Verified by Toppr

The invisible zone of the flame is also called a non-luminous zone which is the zone of complete combustion. Due to complete combustion, the zone becomes the hottest zone of the flame. Hence option C is correct.

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