Which color indicates a strong alkali on universal indicator?

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Multiple Choice

Which color indicates a strong alkali on universal indicator?

Explanation:
Universal indicator shows a range of colors as pH changes, with higher pH indicating more alkaline conditions. Strong alkalis have a very high pH (around 12–14), and at those high pH values the indicator shifts to purple. The purple color signals a solution is a strong base with many OH− ions present. By comparison, blue can indicate a weaker alkali, green is near neutral or only mildly basic, and orange points to acidic conditions. So the color that best signifies a strong alkali is purple.

Universal indicator shows a range of colors as pH changes, with higher pH indicating more alkaline conditions. Strong alkalis have a very high pH (around 12–14), and at those high pH values the indicator shifts to purple. The purple color signals a solution is a strong base with many OH− ions present. By comparison, blue can indicate a weaker alkali, green is near neutral or only mildly basic, and orange points to acidic conditions. So the color that best signifies a strong alkali is purple.

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