A universal indicator...

A universal indicator

can be used in all acid-base titrations

is a mixture of several indicators

is useful in the titration of a weak acid against weak base

has limited pH range like any other indicator.

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The correct Answer is:

A universal indicator is a mixture of several indicators.

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A student was given four unknown solutions in test tubes marked A,B,C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A,B,C and D turned blue, orange, green and red respectively. The test tube which contains sodium chloride solution is:

In a experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in foru beakes containig solutions A,B, C and D. The colour of universal indicator paper in these solutions is a shown below: The solution having lowes pH value is:

(a). What would you expect the pH of pure water to be? (b). What colour would the universal indicator show in an aqueous solution of sugar? Why? (c). A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

When a student added universal indicator solution to one of the following chemicals its colour changed to nave blue. The chemical is most likely to be:

A student adds a few drops of the universal indicator solution to a dilute solution of sodium hydroencarbnonate taken in a test tube. Which of the following colour would he observe?

A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?

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