Which of the following simple household methods can detect the presence of chalk powder in adulterated wheat flour?
Show answer & explanation
Correct answer: A
Explanation
Answer: Mixing with vinegar to observe fizzing reaction
Explanation: Chalk powder is mainly made of calcium carbonate (CaCO₃). When it comes in contact with vinegar (acetic acid), it reacts and produces carbon dioxide gas, which appears as fizzing or effervescence. This simple household test helps detect the presence of chalk powder in adulterated wheat flour.
Reaction:
CaCO₃ + 2CH₃COOH → (CH₃COO)₂Ca + H₂O + CO₂↑
Additional Key Facts
This is a basic acid-carbonate reaction test.
Common adulterants in wheat flour include chalk powder, sawdust, and talc.
Vinegar is a weak acid and safe for household testing.
Fizzing confirms presence of carbonate-based adulterants.
Similar test is used for detecting carbonates in other food samples.
Potential Exam-Oriented Questions & Answers
Question: What is the main chemical in chalk powder?
Answer: Calcium carbonate (CaCO₃)
Question: What indicates the presence of chalk powder in food?
Answer: Fizzing or bubbling reaction