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The substance which is expected to have highest ignition temperature out of the following is ______________:
A.Coal
B.Kerosene
C.Petrol
D.Alcohol

Answer
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Hint:In the given question we are asked about the substance which has the highest ignition temperature. We will check the ignition temperature of the substances and find the answer.

Complete answer:
The ignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in a normal atmosphere without an external source of ignition. The source of ignition may be a flame or a spark. This temperature is required to supply the activation energy needed for combustion.
For the options the ignition temperature are as follows:
The ignition temperature for coal is 580C
The ignition temperature for kerosene is 290C
The ignition temperature for petrol is 400C
The ignition temperature for alcohol is 365C
So from the above values we get to know that the substance with highest ignition temperature is coal.

So the correct option is A. coal.

Note:
Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. Coal is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.