What parameter does an indicator changes, with change in the nature of the solution?

Colour

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Odour

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Both

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None of these

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Solution

The correct option is A Colour
An indicator changes its color when a solution changes its nature. Phenolphthalein and methyl orange are used in titrations to check the endpoint. These are used in acidic and basic titrations respectively. The appearance of pink and reddish-orange colours are their true colours. In alkaline solutions methyl orange is yellow. In alkaline solution, phenolphthalein is pink in colour.

Option (A) is correct.

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Similar questions

Q. Consider the following statements :

(A) Both acids and bases change the colour of all indicators.
(B) If an indicator gives a colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

Consider the following statements:

(a) Both acids and bases change colour of all indicators.

(b) If an indicator gives a colour change with an acid, it does not give a change with a base.

(d) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

(i) All four (ii) a and d (iii) b and c (iv) only d

Question 11
Consider the following statements:

Which of these statements are correct?

(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?
(i) All four
(ii) a and d
(iii) b and c
(iv) only d

Q. Which of the following is an indicator that does not change color to determine the nature of acid or base?

Q. The indicator that changes colour with a base but does not with an acid is:

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