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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
What effect does the concentration of H+ (aq) ions have on the nature of the solution?
Do basic solutions also have H+ (aq) ions? If yes, then why are these basic?
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
litmus
Why does tooth decay start when the pH of mouth is lower than 5.5?
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
(i) Lemon juice
(ii) Solution of washing soda
(iii) Toothpaste
(iv) Vinegar
(v) Stomach juices
The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be:
(a) 7
(b) less than 7
(c) 0
(d) more than 7
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red
What will be action of solution B on litmus?
The salt whose aqueous solution will turn blue litmus to red is:
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate
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Phenolphthalein
