BioMedical Admissions Test (BMAT) 2026 – 400 Free Practice Questions to Pass the Exam

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What color indicates a neutral substance when using a universal indicator?

Blue

Red

Green

The color that indicates a neutral substance when using a universal indicator is green. This stems from the pH scale, which measures the acidity or basicity of a substance. Neutral substances, such as pure water, have a pH of around 7, which is represented by the color green in a universal indicator solution.

The universal indicator is designed to change colors in response to varying pH levels, reflecting the acidity or alkalinity of the substance tested. Colors like blue and purple typically represent more alkaline (basic) conditions, while red indicates acidity. Therefore, green is uniquely identified with neutrality, providing a clear visual cue when assessing the nature of a substance.

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Purple

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