Universal Indicators


 
 
Concept Explanation
 

Universal Indicators

Universal indicator: 

A universal indicator is a mixture of indicators so chosen that it gives  different color for different pH value. These indicators are used to indicate the acidity  and alkalinity of the solution by colour change.

In an acidic medium the indicator will show colors like Red, Orange, yellow, Orangish yellow etc.

In the basic medium the indicator will change its colour to blue violet or purple.

In neutral medium, it will change its colour to green. 

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Sample Questions
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Question : 1

Which of the following are correct ?

(a) In an acidic medium the universal indicator will show colors like Red, Orange, yellow, Orangish yellow etc.

(b) In neutral medium, universal indicator will change its colour to green. 

(c) In the basic medium the universal indicator will change its colour to blue violet or purple.

Right Option : D
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Question : 2

Who proposed pH scale?

Right Option : B
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Question : 3

In an _______________ the indicator will show colors like Red, Orange, yellow, Orangish yellow etc.

Right Option : A
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Explanation
 
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