Which of the following is not a fuel? a)- rp-1 b)- nitrogen tetroxide c)- liquid hydrogen d)- methane

B- Nitrogen Tetroxide

Explanation: Except for the nitrogen tetroxide , other given all options are fuel .Nitrogen Tetroxide is a chemical compound having brownish-red color which is in liquid form having a unpleasant smell, therefore it does not belong to the category of fuel because it cannot be used as a substance for production of heat or power .

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a true.

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