Consider the following statements regarding the China rose indicator: 1. It is prepared by keeping China rose petals in ice-cold water. 2. It turns acidic solutions to dark pink (magenta). 3. It turns basic solutions to green. Which of the statements given above is/are correct?

The correct option is (c). Explanation Indicators are substances used to determine the acidic or basic nature of a solution by changing colour. China rose (Hibiscus rosa-sinensis) is a natural indicator extracted from the petals of the flower. Statement-wise Analysis: - Statement 1 is Incorrect. The China rose indicator is prepared by keeping the petals in warm water for some time until the water becomes coloured. Warm water facilitates the extraction of the pigment. Ice-cold water is not used for this process. - Statement 2 is Correct. When the China rose indicator is added to an acidic solution (such as lemon juice or vinegar), the solution turns to a dark pink (magenta) colour. - Statement 3 is Correct. When the China rose indicator is added to a basic solution (such as baking soda solution or soap water), the solution turns green. Key Takeaway: China rose indicator is prepared using warm water. It distinguishes substances by turning acidic solutions dark pink (magenta) and basic solutions green.

NCERT Class 7 Science — Chapter 1: Acids, bases and salts

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Consider the following statements regarding the China rose indicator:

It is prepared by keeping China rose petals in ice-cold water.
It turns acidic solutions to dark pink (magenta).
It turns basic solutions to green.

Which of the statements given above is/are correct?

Official previous-year question

Verified 1 Aug 2026.

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

Indicators are substances used to determine the acidic or basic nature of a solution by changing colour. China rose (Hibiscus rosa-sinensis) is a natural indicator extracted from the petals of the flower.

Statement-wise Analysis:

Statement 1 is Incorrect. The China rose indicator is prepared by keeping the petals in warm water for some time until the water becomes coloured. Warm water facilitates the extraction of the pigment. Ice-cold water is not used for this process.
Statement 2 is Correct. When the China rose indicator is added to an acidic solution (such as lemon juice or vinegar), the solution turns to a dark pink (magenta) colour.
Statement 3 is Correct. When the China rose indicator is added to a basic solution (such as baking soda solution or soap water), the solution turns green.

Key Takeaway:

China rose indicator is prepared using warm water. It distinguishes substances by turning acidic solutions dark pink (magenta) and basic solutions green.

Your note

More from Chapter 1: Acids, bases and salts

With reference to the chemical nature of substances, consider the following statements: 1. All substances that taste sour contain acids. 2. Substances that taste bitter and feel soapy on touching are generally acidic in nature. 3. Baking soda is an example of a substance that has a bitter taste and is basic in chemical nature. Which of the statements given above is/are correct?

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Consider the following statements regarding naturally occurring acids: 1. Lactic acid is the primary constituent of vinegar. 2. Oxalic acid is found in spinach. 3. Ascorbic acid is also known as Vitamin C. Which of the statements given above is/are correct?

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Which one of the following pairs is correctly matched regarding the acid present in the substance?

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With reference to bases and their sources, consider the following pairs: 1. Calcium hydroxide : Lime water 2. Ammonium hydroxide : Window cleaner 3. Magnesium hydroxide : Soap 4. Sodium hydroxide : Milk of magnesia How many of the above pairs are correctly matched?

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Consider the following statements about 'Litmus', a natural indicator: 1. It is extracted from lichens. 2. It has a green colour in distilled water. 3. It turns blue when added to an acidic solution. Which of the statements given above is/are correct?

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The correct option is (c).

Explanation

Statement-wise Analysis:

Statement 1 is Incorrect. The China rose indicator is prepared by keeping the petals in warm water for some time until the water becomes coloured. Warm water facilitates the extraction of the pigment. Ice-cold water is not used for this process.
Statement 2 is Correct. When the China rose indicator is added to an acidic solution (such as lemon juice or vinegar), the solution turns to a dark pink (magenta) colour.
Statement 3 is Correct. When the China rose indicator is added to a basic solution (such as baking soda solution or soap water), the solution turns green.

Key Takeaway:

China rose indicator is prepared using warm water. It distinguishes substances by turning acidic solutions dark pink (magenta) and basic solutions green.