Which of the following is the endothermic reaction ?
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An endothermic reaction absorbs heat from the surroundings, causing a temperature decrease. Let's analyze the options:
Diluting concentrated sulphuric acid is highly exothermic; it releases a large amount of heat.
Combustion of fuel is a classic exothermic reaction, releasing heat and light.
Heating carbon with sulphur to form carbon disulphide (C + 2S → CS) requires continuous heat input, making it endothermic.
"All of these" is incorrect because not all options are endothermic.
Final Answer: Heating carbon with sulphur to form carbon disulphide.