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Question
A, B, C and D are four solutions with pH 5, 1, 13 and 7 respectively. The colour of the solutions when tested with pH paper respectively are
A, B, C and D are four solutions with pH 5, 1, 13 and 7 respectively. The colour of the solutions when tested with pH paper respectively are
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Solution
The correct option is A Yellow, red, violet, green
The pH paper is a paper impregnated with the universal indicator, which is a mixture of several indicators and shows different colours at different concentrations of hydrogen ions in a solution. The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution while values more than 7 indicate a basic solution.
The colours from yellow to red indicate an acidic solution, colours from blue to violet indicate a basic solution and green colour indicates that a solution is neutral.
So, the colours of solutions A, B, C and D are yellow, red, violet and green respectively.
Hence, the correct answer is option (a).
The pH paper is a paper impregnated with the universal indicator, which is a mixture of several indicators and shows different colours at different concentrations of hydrogen ions in a solution. The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution while values more than 7 indicate a basic solution.
The colours from yellow to red indicate an acidic solution, colours from blue to violet indicate a basic solution and green colour indicates that a solution is neutral.
So, the colours of solutions A, B, C and D are yellow, red, violet and green respectively.
Hence, the correct answer is option (a).
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