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_
Related questions
Besides VSEPR and the Kossel Lewis approach, which two theories are listed?Which theory is abbreviated VSEPR?Why can lattice enthalpy not be calculated directly from attraction and repulsion alone?Ionic bonds form most easily between elements with low ionization enthalpies and high negaWhat is the lattice enthalpy of sodium chloride?Lattice enthalpy is the energy required to separate one mole of an ionic solid into:The structures contributing to a resonance hybrid are called:Why was the concept of resonance introduced?