When a mixture of hydrogen and oxygen is sparked, the reaction is
APhotolytic split by visible light only
BSlow at room temperature with no flame
CEndothermic absorbing heat from air
DExplosive with a loud 'pop' sound
Answer & Solution
Correct answer: D. Explosive with a loud 'pop' sound
1. A mixture of H2 and O2 is the 'oxy-hydrogen' mixture.
2. Sparking releases a lot of energy very quickly.
3. This produces a loud pop and high temperature.
4. The reaction is highly exothermic and explosive.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on properties of hydrogen_
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