Tell whether this all is true or false

Dear student

3 Ignition temperature ofa substance is defined as the temperature at which ignition starts. Hence, statement is false
4. This statement is true since calorific value is amount of heat energy released on combustion of 1 kg of fuel, higher the calorific value, better the fuel.
5. This statement is true since blue zone has the highest temperature and complete combustion takes place here.
6. This statement is true since lowest temperature is observed in innermost part of candle flame and is also known as dark zone.

Regards

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