The two colors seem at the extreme end of the pH chart ?
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Red & Blue
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Red & Green
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Green & Blue
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Orange & Green
A
Correct answer
Explanation
The pH scale ranges from 0 (very acidic, red) to 14 (very basic/alkaline, blue/violet). Red represents the acidic extreme while blue represents the basic extreme. Green is typically near neutral (pH 7). This tests knowledge of the pH color spectrum used in indicators and pH paper.