Chemistry March 2020 - Std 12th Science HSC Maharashtra ...- action of soaps mcq 2020 ,Board Question Paper: February 2020 Q.7. Write the name and chemical formula of one ore of zinc, Define: Quaternary ammonium salt. Q.8. What is the action of acidified potassium dichromate on the following: a. KI b. H2S Q.9. Define optical activity. How many optical isomers are possible for glucose? Q.10lass 12 Important Questions for Chemistry - Chemistry in ...Apr 22, 2019·NCERT Exemplar Class 12 Chemistry is very important resource for students preparing for XII Board Examination. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 12.. Question from very important topics are covered by NCERT Exemplar Class 12.You also get idea about the type of questions and …
Sociology MCQs for test preparation material. The following Sociology quizzes are from the topics like, why sociability is necessary to man, manifestations of sociability of man, culture, society, social interaction, social control, socio-cultural change, social institutions, sociological theory, sociological research and related theory.
10. What can you do to avoid that a person experiences a short period of uncousciousness “Fainting”. A. Speak to the victim and administer a pain stroke. B. Let the victim remain in its chair. C. Apply fresh air, let the victim lay-down and reassure the victim. Ans: C. FIRST AID MCQs. 11.
Mar 03, 2022·CBSE 10th Topics Removed for 2020-21: The Central Board of Secondary recently released the revised syllabus for all subjects of class 10. Board has deleted some portion of the syllabus for the ease of students who will be taking their CBSE Board Exam next year. Due to COVID-19, almost the first four months of this session have already passed in ...
Solution by Mcqs Clouds. Answer: Option A Explanation: The ionic-end of soap dissolves in water while the carbon chain dissolves in oil. The action of soaps and detergents is based on the presence of both hydrophobic and hydrophilic groups in the molecule.
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Sep 23, 2020·Soaps are sodium or potassium salts of long-chain carboxylic acids. Detergents are generally ammonium or sulphonate salts of long chain carboxylic acids. Cleaning Action of Soap A soap molecule is mae up of two parts a long hydrocarbon part and a short ionic part containing –COO – Na + group. The soap molecule is said to have a tadpole ...
Sep 16, 2021·(d) It reacts with fatty acids, forming calcium soaps which act as an emulsifying agent. 14.Uses of Sodium thiosulphate (a) 1.6% solution is used as Deodorant, gargle and mouthwash. (b) it is employed as an ingredient in dusting powder. (c) used mainly as eye & mouth wash for local anti-infective action.
MCQ: Pick out the wrong statement? Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action; Soap powder is prepared by mixing soap with hydrated sodium carbonate; Detergents differ from soaps in their action in hard water
I. Multiple Choice Questions (Type-I) 1. Which of the following statements is not correct. (i) Some antiseptics can be added to soaps. (ii) Dilute solutions of some disinfectants can be used as antiseptic. (iii) Disinfectants are antimicrobial drugs. (iv) Antiseptic medicines can be ingested. Solution: Option (iv) is the answer. 2.
Aug 03, 2020·August 3, 2020 by Prasanna. Chapter 4 Carbon and its Compounds Class 10 Science Important Questions and Answers PDF will help you in scoring more marks. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Chemical Reactions and Equations Chapter.
Surface tension is the tendency of fluid surfaces to shrink into the minimum surface area possible. Intermolecular forces such as Van der Waals Force draw the liquid particles together. The ratio of the surface force F to the length L along which the force acts. T= F/L. Where, F is the force per unit length. L is the length in which force act.
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Feb 25, 2020·i) solid X is NaOH and the gas Y is CO 2. ii) solid X is Na 2 CO 3 and the gas Y is CO 2. iii) solid X is sodium acetate and the gas y is CO 2. iv) solid X is sodium chloride and the gas Y is CO 2. Carbon exists in the atmosphere in the form of. (a) carbon monoxide only. (b) carbon monoxide in traces and carbon dioxide.
MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. We have Provided Carbon and Its Compounds Class 10 Science MCQs Questions with Answers to help students …Sep 24, 2020 · The commonly used emulsifying agents are soaps, detergents, lyophilic colloids, proteins, gums, gelatin, caesin, agar etc. 5.18.
Aug 14, 2020·Explain the cleansing action of soaps. (Delhi 2015) Answer: Soaps are sodium or potassium salts of long chain carboxylic acids. Detergents are ammonium or sulphonate salts. Soap molecule has two ends, the charged end that gets attracted towards water is called hydrophilic and the long carbon chain that repels water is called hydrophobic tail.
Apr 28, 2020·3. Effect of feedback on the plant is to. a) Control system transient response. b) Reduce the sensitivity to plant parameter variations. c) Both (a) and (b) d) None of these. Ans: (c) 4. Transfer function of a system is defined as the ratio of output to input in.
Handwashing with plain soap and water reduced the presence of bacteria to 8% (comparison of both handwashing arms: p < 0.001). The effect did not appear to depend on the bacteria species. Handwashing with non-antibacterial soap and water is more effective for the removal of bacteria of potential faecal origin from hands than handwashing with ...
May 08, 2017·Cleansing action of soaps: The dirt present on clothes is organic in nature and insoluble in water.Therefore, it cannot be removed by only washing with water. When soap is dissolved in water, its hydrophobic ends attach themselves to the dirt and remove it from the cloth.
Dec 01, 2020·The cleansing action of both soaps and detergents results from their ability to lower the surface tension of water, to emulsify oil or grease and to hold them in a suspension in water. This ability is due to the structure of soaps and detergents. In water, a sodium soap dissolves to form soap anions and sodium cations.