International General Certificate of Secondary Education (IGCSE) Chemistry Practice Exam

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What is the pH and universal indicator color of a neutral solution?

1-3, red
4-6, yellow
7, green
8-10, blue

The correct answer is: 7, green

A neutral solution, such as pure water, has a pH of 7. The pH scale ranges from 0 to 14, where values less than 7 indicate acidity, values greater than 7 indicate alkalinity, and a value of exactly 7 indicates neutrality. Universal indicators are used to visually represent the pH level and while a neutral solution has a pH of 7, the color associated with this pH when using a universal indicator is green. Therefore, the response is that a neutral solution has a pH of 7 and appears green when measured with a universal indicator. This characteristic helps in determining whether a solution is acidic, neutral, or alkaline based on its pH level.