Hydrogen burns in air with a
AGreenish flame producing copper salts
BBright yellow flame producing sulphur
CPale blue flame producing water vapour
DDark red flame producing carbon black
Answer & Solution
Correct answer: C. Pale blue flame producing water vapour
1. The chapter section on properties lists hydrogen's flame colour.
2. Hydrogen + oxygen gives water as the only product.
3. The combustion is clean with a pale blue flame.
4. Hence option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on properties: burning_
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