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प्रश्न
What is a universal indicator? For what purpose is it used?
उत्तर
A universal indicator is a combination of different dyes that show colour change with solutions of different pH values on the complete pH scale.
A universal indicator paper is used to differentiate between acids and bases. It also differentiates between strong acids and bases and between weak acids and bases on the basis of the intensity of colour change.
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संबंधित प्रश्न
Five solutions, A, B, C, D and E, when tested with universal indicator, showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is
- neutral?
- strongly alkaline?
- strongly acidic?
- weakly acidic?
- weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
Fill in the blank in the following sentences:
Onion and vanilla extract are..........................indicators.
If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy?
Lemon juice, Vinegar, Banking soda solution
Give reason for your choice.
Fill in the following blank with suitable words:
The more acidic a solution, the ................. the pH.
Name two common antacids.
When a solution becomes more acidic, does the pH get higher or lower?
A solution turns blue litmus red. Its pH is likely to be:
(a) 7
(b) 5
(c) 8
(d) 14
In acidic solution, the colour of the hibiscus indicator paper will change to _____.
Which one of the following can be used as an acid- base indicator by a visually impared student?
Assertion: Methyl orange and phenolphthalein are natural indicators.
Reason: Methyl orange is yellow in colour while phenolphthalein is pink.
