Two elements which can form a large number of compounds are
A. carbon and hydrogen
B. carbon and nitrogen
C. carbon and oxygen
D. carbon and sulphur
Answer: Option A
A. carbon and hydrogen
B. carbon and nitrogen
C. carbon and oxygen
D. carbon and sulphur
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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