MEDIUM
Earn 100

In an experiment, phenolphthalein was added to caustic soda. What will happen if diluted hydrochloric acid is added to this mixture. Explain.

Important Questions on Acids, Bases and Salts

EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Which of the following phenomena occur, when a small amount of acid is added to water?
MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators

You are provided with aqueous solutions of three salts A, B and C. 2‐3 drops of blue litmus solution, red litmus solution and phenolphthalein were added to each of these solutions in separate experiments. The change in colour of different indicators were recorded in the following table:

Sample  With blue litmus solution   With red litmus solution    With phenolphthelein
     A            No change            Turns blue          Turns pink
     B            No change            No change          No change
    C            Turns red            No change          No change

On the basis of above observations, identify A, B and C from the following options:

EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
A solution turns red litmus blue. Its pH is likely to be
MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
A solution turns methyl orange into yellow the approximate pH of solution is
MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators

Which of the following is not an olfactory indicator?

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Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Acid turn methyl orange: 
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
If the H+ concentration of an aqueous solution is 0.001M,, then the pOH of the solution would be
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
What happens, when methyl orange solution mixed with HCl?
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
The indicators which turn red in acid solution are:
MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
The colour of Methyl orange in alkali solutions is _____ .
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators

An indicator is added to Potassium Hydroxide and the solution turns pink:

Name the indicator that is added.

MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Name the source from which litmus solution is obtained. What is the use of this solution?
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Hydrochloric acid solution affects ______ litmus paper.
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
A substance is sour in taste, not soapy to touch and has no effect on yellow turmeric solution. It will affect _____ litmus paper.
EASY
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators

Turmeric is an example of a _____ indicator 

(Blue, natural, neutral, indicators, lichens)

MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
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Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
What is an indicator? Name three indicators.
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Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Litmus is a dye which is extracted from _____.
(Blue, natural, neutral, indicators, lichens)
MEDIUM
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Which one of these is not a natural indicator?
HARD
Science>Chemistry>Acids, Bases and Salts>Acid and Base Indicators
Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and the third is a sugar solution. How will you identify them? You have only turmeric indicator.