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

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

Official previous-year question

Verified 1 Aug 2026.

Options

ASpinach : Tartaric acid
BAmla : Ascorbic acid
CCurd : Acetic acid
DTamarind : Lactic acid

Did you get this right?

Solution

The correct option is

Amla : Ascorbic acid

Explanation

Naturally occurring acids, often referred to as organic acids, are found in various plant and animal products. Identifying the specific acid present in common food substances is a fundamental aspect of understanding acid-base chemistry in everyday life.

Analysis of Options:

(a) Curd : Acetic acid - Incorrect. Curd (sour milk) contains Lactic acid. Acetic acid is the primary component of vinegar.
(b) Spinach : Tartaric acid - Incorrect. Spinach is a significant source of Oxalic acid. Tartaric acid is typically found in tamarind, grapes, and unripe mangoes.
(c) Amla : Ascorbic acid - Correct. Amla (Indian Gooseberry) is a rich source of Vitamin C, chemically known as Ascorbic acid. Citrus fruits like lemons and oranges contain Citric acid, but Amla is specifically noted for Ascorbic acid.
(d) Tamarind : Lactic acid - Incorrect. Tamarind contains Tartaric acid. Lactic acid is found in curd.

Key Takeaway:

Common natural sources of acids include Vinegar (Acetic acid), Oranges (Citric acid), Tamarind (Tartaric acid), Tomatoes (Oxalic acid), Curd (Lactic acid), and Ant stings (Methanoic/Formic acid).

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?

medium

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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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?

easy

With reference to Turmeric as an indicator, consider the following statements: 1. Turmeric paste remains yellow in acidic solutions. 2. Turmeric paste turns blue in basic solutions. 3. Soap solution applied to a turmeric stain turns it red. Which of the statements given above is/are correct?

medium

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The correct option is

Amla : Ascorbic acid

Explanation

Analysis of Options:

(a) Curd : Acetic acid - Incorrect. Curd (sour milk) contains Lactic acid. Acetic acid is the primary component of vinegar.
(b) Spinach : Tartaric acid - Incorrect. Spinach is a significant source of Oxalic acid. Tartaric acid is typically found in tamarind, grapes, and unripe mangoes.
(c) Amla : Ascorbic acid - Correct. Amla (Indian Gooseberry) is a rich source of Vitamin C, chemically known as Ascorbic acid. Citrus fruits like lemons and oranges contain Citric acid, but Amla is specifically noted for Ascorbic acid.
(d) Tamarind : Lactic acid - Incorrect. Tamarind contains Tartaric acid. Lactic acid is found in curd.

Key Takeaway:

Common natural sources of acids include Vinegar (Acetic acid), Oranges (Citric acid), Tamarind (Tartaric acid), Tomatoes (Oxalic acid), Curd (Lactic acid), and Ant stings (Methanoic/Formic acid).