Which one of the following is burned in oxygen, producing a very hot flame, used for welding and cutting metals?
A. Butane
B. Methane
C. Ethylene
D. Acetylene
Answer: Option D
A. Butane
B. Methane
C. Ethylene
D. Acetylene
Answer: Option D
Traditional 'battery' contains which of the following chemicals?
A. Ethylene glycol
B. Sulphuric acid
C. Sodium bicarbonate
D. Ethanol
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