In a compound the elements are always present in definite proportions by
A. mass
B. volume
C. size
D. None of these
Answer: Option A
A. mass
B. volume
C. size
D. None of these
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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