Question

The pH value of a solution is in the range of 6 to 8. What is the colour developed when a student adds three drops of universal indicator in the solution?

(a) Red
(b) Blue

(c) Green
(d) Orange

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Answer 1

Answer :

• Option C (green).

Explanation:

• The colour developed will be green. This is because, the pH paper shows green colour for solution which are neutral. A solution with pH 6 to 8 is a neutral solution and hence, the pH paper will develop a green colour.

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Additional Information:

• pH scale is a scale which is used for measuring hydrogen ion concentration in a solution. pH of a solution is defined as the negative logarithm (to the base 10) of the hydrogen ion concentration in the solution.
• The pH paper develops different colours when treated with different solutions (acidic, basic & neutral).
• It shows red-orange in acidic solutions, green is neutral solutions & blue in basic solutions.
• The pH of a neutral solution is 7. pH ranging from 1-6 are acidic and oh ranging from 8-14 are basic.