Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.

Academic Chemistry NCERT Class 10

Phenolphthalein is an indicator that is pink in alkaline solution but turns colourless in acidic solution.

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Updated on: 10-Oct-2022

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Name an indicator which is red in acid solution but turns blue in basic solution.
A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again?(1) HCI solution (2) NaOH solution (3) NH3 solution (4) NaCI solution
The indicator which produces a pink colour in an alkaline solution:(a) Methyl orange(b) Turmeric paper(c) Phenolphthalein(d) Litmus paper
An element Z reacts with water to form a solution which turns phenolphthalein indicator pink. The element Z is most likely to be:Sulphursodiumcarbonsilicon
Two Solution X and Y are tested the universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
A solution turns phenolphthalein indicator pink. The most likely pH of the solution will be:(a) 6 (b) 4 (c) 9 (d) 7
Wasp sting contains:(a) A sugar solution (b) An acidic liquid (c) A salt solution (d) An alkaline liquid
When an aluminium strip is kept(a) Green solution of FeSO4 slowly turns brown(b) Green solution of FeSO4 rapidly turns brown(c) No change in colour of FeSO4(d) Green solution of FeSO4 slowly turns colourless.
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are(a) red and blue(b) blue and red(c) pink and colourless(d) colourless and pink
Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
(a) What is an indicator? Name three common indicators.(b) Name the acid-base indicator extracted from lichen. (c) What colour does the turmeric paper turn when put in an alkaline solution?
On adding phenolphthalein indicator to colourless solution, no change is observed. What is the nature of this solution?(a) Basic(b) Either acidic or basic(c) Either acidic or neutral(d) Either basic or neutral
Bee sting contains:(a) An acidic liquid (b) A salt solution (c) An alkaline liquid (d) An alcohol
What is Indicator and Litmus Solution?
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.(a) What will be the action of solution A on litmus? (b) What will be action of solution B on litmus? (c) Name any two substances which can give solutions like A. (d) Name any two substances which can give solutions like B. (e) What sort of reaction takes place when solution A reacts with solution B?

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