Which of the following pairs of ‘Natural source-Acid’ is NOT correctly matched?
Tamarind-Oxalic acid
Understanding Acids in Natural Sources
This question asks us to identify the pair of 'Natural source-Acid' that is NOT correctly matched. This requires knowledge about which common acids are found in various natural substances.
Analyzing the Given Natural Source and Acid Pairs
Let's examine each option provided and determine the primary acid usually found in the respective natural source:
- Tamarind - Oxalic acid: Tamarind is well-known for its sour taste, which is primarily due to the presence of tartaric acid. While trace amounts of other acids might be present, tartaric acid is the dominant one. Oxalic acid is commonly found in foods like spinach, rhubarb, and tomatoes. Therefore, matching tamarind with oxalic acid appears incorrect.
- Vinegar - Acetic acid: Vinegar is essentially a dilute solution of acetic acid produced through the fermentation of ethanol. This is a widely recognized and correct match.
- Curd - Lactic acid: Curd (or yogurt) is produced by the bacterial fermentation of milk. This process converts lactose (milk sugar) into lactic acid, which gives curd its characteristic sour taste and texture. This is a correct match.
- Orange - Citric acid: Citrus fruits, such as oranges, lemons, and grapefruits, are rich sources of citric acid. Citric acid is responsible for their tart flavor. This is a correct match.
Based on this analysis, the pair 'Tamarind-Oxalic acid' is the only one that is not correctly matched.
Correct Matching of Natural Sources and Acids
Here is a table summarizing the typical acids found in these natural sources:
| Natural Source | Primary Acid Present |
|---|---|
| Tamarind | Tartaric acid |
| Vinegar | Acetic acid ($\text{CH}_3\text{COOH}$) |
| Curd | Lactic acid ($\text{C}_3\text{H}_6\text{O}_3$) |
| Orange | Citric acid ($\text{C}_6\text{H}_8\text{O}_7$) |
Comparing this table with the given options, it is clear that the pair 'Tamarind-Oxalic acid' is the incorrect match, as tamarind contains tartaric acid.
Conclusion on Incorrect Pair
The question asks for the pair that is NOT correctly matched. Our analysis shows that Tamarind is primarily associated with Tartaric acid, not Oxalic acid. The other pairs (Vinegar-Acetic acid, Curd-Lactic acid, Orange-Citric acid) are correctly matched.
Revision Table: Common Natural Sources and Acids
| Natural Source | Primary Acid | Chemical Formula |
|---|---|---|
| Tamarind, Grapes | Tartaric acid | $\text{C}_4\text{H}_6\text{O}_6$ |
| Vinegar | Acetic acid | $\text{CH}_3\text{COOH}$ |
| Curd, Sour Milk | Lactic acid | $\text{C}_3\text{H}_6\text{O}_3$ |
| Oranges, Lemons, Citrus fruits | Citric acid | $\text{C}_6\text{H}_8\text{O}_7$ |
| Spinach, Tomatoes, Rhubarb | Oxalic acid | $\text{C}_2\text{H}_2\text{O}_4$ |
| Apples | Malic acid | $\text{C}_4\text{H}_6\text{O}_5$ |
| Tea | Tannic acid | Complex mixture |
Additional Information about Natural Acids
Acids found in natural sources are often organic acids. They play various roles, including providing flavor, acting as preservatives, and participating in metabolic processes. Understanding these common sources helps in identifying and classifying different types of acids.
- Acetic Acid: A weak acid, crucial in vinegar production and widely used in cooking and industry.
- Lactic Acid: Produced during fermentation, found in dairy products and also produced in muscles during intense activity.
- Citric Acid: A common food additive and preservative, also used as a cleaning agent. It's part of the metabolic process known as the citric acid cycle.
- Tartaric Acid: Found in grapes, bananas, and tamarinds. It's also used in baking powder as a leavening agent.
- Oxalic Acid: Found in many plants. It can be toxic in large amounts as it binds to calcium, potentially forming kidney stones.
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