15 extra multiple-choice questions for Chemistry in Everyday Life (12th Standard Chemistry, Samacheer Kalvi), beyond the ones printed in the textbook — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
What is the therapeutic index of a drug defined as?
- A. The ratio of the minimum curative dose to the maximum tolerated dose
- B. The ratio of the maximum tolerated dose to the minimum curative doseCorrect
- C. The product of the maximum tolerated dose and the minimum curative dose
- D. The difference between the maximum tolerated dose and the minimum curative dose
Explanation. The therapeutic index is the ratio of the maximum tolerated dose to the minimum curative dose. A higher index represents a safer drug.
Q2
The word "drug" is derived from the French word "drogue", which means:
- A. Dry herbCorrect
- B. Bitter root
- C. Healing potion
- D. Active chemical
Explanation. The term drug originates from the French word drogue, which means dry herb, historically referring to natural medicinal sources.
Q3
Which of the following organic compounds is classified as a sugar substituent because it is metabolised without the influence of insulin?
- A. Aspartame
- B. Alitame
- C. SorbitolCorrect
- D. Saccharin
Explanation. Sorbitol is a sugar substituent that is metabolised without insulin, unlike artificial sweeteners like aspartame, alitame, and saccharin.
Q4
Why is common salt (sodium chloride) added to the reaction mixture during the preparation of soap?
- A. To act as a catalyst for the saponification reaction
- B. To decrease the solubility of soap and help precipitate it outCorrect
- C. To adjust the pH of the soap to make it neutral
- D. To introduce sodium ions as the active cleansing agents
Explanation. Common salt is added during saponification to decrease the solubility of the soap, causing it to precipitate from the aqueous solution.
Q5
What is the IUPAC name for the cationic detergent n-hexadecyltrimethyl ammonium chloride?
- A. N,N,N-trimethylhexadecan-1-aminium chlorideCorrect
- B. Sodium lauryl sulphate
- C. Pentaerythrityl stearate
- D. 3-hydroxy-2,2-bis(hydroxymethyl)propyl heptanoate
Explanation. The IUPAC name of the cationic detergent n-hexadecyltrimethyl ammonium chloride is N,N,N-trimethylhexadecan-1-aminium chloride.
Q6
Which of the following compounds is classified as a non-ionic detergent?
- A. Sodium lauryl sulphate
- B. n-hexadecyltrimethyl ammonium chloride
- C. Pentaerythrityl stearateCorrect
- D. Sodium dodecylbenzene sulphonate
Explanation. Pentaerythrityl stearate is a non-ionic detergent. Sodium lauryl sulphate is anionic, and n-hexadecyltrimethyl ammonium chloride is cationic.
Q7
What is the IUPAC name of the monomer used to prepare polyacrylonitrile (PAN)?
- A. Prop-2-enenitrileCorrect
- B. Chloroethene
- C. Tetrafluoroethene
- D. Vinyl chloride
Explanation. Polyacrylonitrile (PAN) is synthesised from the monomer acrylonitrile, which has the IUPAC name prop-2-enenitrile.
Q8
Which synthetic polymer is commonly used as a wool substitute for making blankets and sweaters?
- A. Nylon-6,6
- B. Polyacrylonitrile (PAN)Correct
- C. Bakelite
- D. Melamine-formaldehyde resin
Explanation. Polyacrylonitrile (PAN) serves as an effective wool substitute used in blankets, sweaters, and other warm apparel.
Q9
Which polymer represents a linear phenol-formaldehyde resin and is widely used in paints?
- A. Soft bakelite
- B. Hard bakelite
- C. NovolacCorrect
- D. Melamine resin
Explanation. Novolac is a linear polymer of phenol and formaldehyde used in paints, while cross-linked forms produce bakelite.
Q10
Which of the following articles is typically manufactured using hard bakelite?
- A. Soft binding glues
- B. Blankets and sweaters
- C. Varnishes and paints
- D. Combs and pensCorrect
Explanation. Hard bakelite is used to manufacture combs, pens, and other durable molded articles due to its cross-linked thermosetting properties.
Q11
Which monomers undergo condensation polymerisation to form melamine formaldehyde resin?
- A. Melamine and formaldehydeCorrect
- B. Melamine and acetaldehyde
- C. Phenol and formaldehyde
- D. Urea and formaldehyde
Explanation. Melamine formaldehyde resin is formed through the condensation polymerisation of melamine and formaldehyde monomers.
Q12
Which elements are specifically mentioned in the textbook as being used as strong disinfectants?
- A. Fluorine and bromine
- B. Chlorine and iodineCorrect
- C. Sodium and potassium
- D. Nitrogen and oxygen
Explanation. Chlorine and iodine are highlighted in the chapter evaluation as being used as strong disinfectants.
Q13
Why are synthetic detergents considered superior to soaps for cleansing purposes?
- A. They are completely biodegradable and non-polluting
- B. They can be used effectively in hard water and acidic conditionsCorrect
- C. They are formulated from natural glycerides and oils
- D. They are less soluble in water, making them last longer
Explanation. Synthetic detergents do not form insoluble precipitates with hard water ions and remain functional even under acidic conditions.
Q14
Which of the following is NOT a characteristic of an ideal drug at its therapeutic concentration?
- A. Bio-compatible
- B. Bio-degradable
- C. Non-toxic
- D. Irreversible high toxicityCorrect
Explanation. An ideal drug must be non-toxic, bio-compatible, and bio-degradable, without exhibiting harmful side effects at lower concentrations.
Q15
What is the specific treatment of a disease using chemical compounds or medicine called?
- A. ChemotherapyCorrect
- B. Saponification
- C. Denaturation
- D. Polymerisation
Explanation. The specific treatment of a disease using therapeutic chemicals that target biological macromolecules is called chemotherapy.
About these Chemistry in Everyday Life questions
These are the Additional multiple-choice questions for Chemistry in Everyday Life from the Tamil Nadu State Board (Samacheer Kalvi) 12th Standard Chemistry syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Chemistry in Everyday Life?
This chapter has 15 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 12th Standard Chemistry MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Chemistry in Everyday Life book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
