Multiple choice general knowledge science & technology

Which of the following can not be called a combustion process.

  1. CH4 + 2 O2 => CO2 + 2H2O

  2. 2H2 + O2 => 2H2O

  3. CH2S + 6F2 => CF4 + 2HF + SF6

  4. NaCl + AgNO3 => NaNO3 + AgCl
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option D (NaCl + AgNO3 → NaNO3 + AgCl) is a precipitation/double displacement reaction, not a combustion process. Combustion involves rapid oxidation with heat and light (options A, B, C all show fuel + oxidizer → products). Option C shows reaction with fluorine, which is even more vigorous than typical combustion.

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