Which of the following elements is found in all organic compounds?
A. Carbon
B. Calcium
C. Nitrogen
D. Oxygen
Answer: Option A
A. Carbon
B. Calcium
C. Nitrogen
D. Oxygen
Answer: Option A
Traditional 'battery' contains which of the following chemicals?
A. Ethylene glycol
B. Sulphuric acid
C. Sodium bicarbonate
D. Ethanol
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