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By what type of reaction are Nitrogen oxides caused?

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By what type of reaction are Nitrogen oxides caused?

(a) Endothermic reaction

(b) Combustion reaction

(c) Exothermic reaction

(d) Synthesis reaction

The question was asked in an online interview.

Question is from Environmental Aspects of Power Generation topic in portion Steam Generators & Accessories of Energy Engineering

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Best answer
Right answer is (a) Endothermic reaction

Best explanation: Production of nitrogen oxides is an endothermic reaction and its concentration is temperature dependent. NOx emissions can be reduced by lowering the combustion temperature and by eliminating hotspots in the furnace.

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