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

china rose

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turmeric

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phenophthalein

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both B and C

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Solution

The correct option is D both B and C
China rose (containing anthocyanin pigment, having purple colour) changes it's colour to pinkish red in acidic medium and green in alkaline medium.
Turmeric (yellow in colour) remains yellow in acidic medium and turns into red colour in basic medium.
Phenolphthalein a synthetic indicator does not undergo any colour change in acidic medium but it changes it's colour to pink in basic conditions.
Thus both turmeric and phenolphthalein change their colour in basic medium but not acidic.

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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. Sir/ ma'am pls help me by answering fast...it's really urgent

Which colour does turmeric indicator changes when ---
a)an acid is added.
b)a base is added.

Thanks.

Q. What colour does china rose indicator gives witha acid and bases?

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