Soaps and DetergentsPractice Questions & MCQs
Practice Soaps and Detergents questions from Carbon and its Compounds (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Soaps and DetergentsQuiz - Solve & Score
Q1. Which cleans effectively in hard water (NCERT)?
- A.plain water
- B.soap
- C.detergent
- D.lime water
Answer: C. detergent
We are told that the numerical data stated in the question (chemistry, chapter 'Carbon and its Compounds'). What we must find: the requested quantity. The principle that connects these is - so the listed property = detergent. Hard water has Ca2+ / Mg2+ ions. That lands on option C) detergent. As for the others, option A) 'plain water' misses the point - Plain water cannot remove greasy dirt well; option B) 'soap' is wrong because Soap forms scum in hard water.
Q2. Which works equally well in both soft and hard water?
- A.plain water
- B.soap
- C.detergent
- D.lime water
Answer: C. detergent
Data from the problem: the data stated in the problem. To find: the unknown asked in the stem. Working tool - so the listed property = detergent. This is the equation that links the given quantities to the unknown (chemistry, chapter 'Carbon and its Compounds'). What makes this the correct method - hard water has Ca2+ / Mg2+ ions. Consequently the answer is C) detergent. The other choices: option A) 'plain water' doesn't hold - Plain water does not clean greasy dirt well; option B) 'soap' is incorrect: Soap fails in hard water (scum); option D) 'lime water' doesn't hold - Lime water is not a cleansing agent.
Q3. Which by-product makes soap manufacture commercially valuable?
- A.chlorine
- B.ethanol
- C.hydrogen
- D.glycerol
Answer: D. glycerol
What is the textbook's take? Soaps are sodium salts of long-chain fatty acids (RCOONa); the head (-COO- Na+) is polar / hydrophilic and the tail (-R) is non-polar / hydrophobic, which enables emulsification of dirt => this dual structure explains the action; hence the answer = glycerol. Does that line up with one of the options? Yes - Correct. And the rest? option A) 'chlorine' doesn't hold - No chlorine is produced in saponification; option B) 'ethanol' is wrong because Glycerol, not ethanol, is the by-product. Pick: D) glycerol.
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