Gaseous molecules are then adsorbed on the surface of the catalyst. What is shape selective catalysis? 5.6. Coordination Compounds. However, at higher concentrations, due to the formation of aggregated particles these substances behave like colloidal solutions. Ans: In the heterogeneous catalysis carried over metal surface, adsorbed reactant species combine to form the products. Ans: Pt and Pd form inert electrodes, i.e., they are not attacked by the ions of the electrolyte or the products of electrolysis. For example, wood charcoal’s activated is done by heating it between 650 K and 1330 K in vacuum or air. These sols are less stable than the lyophilic sols. substance”. Question 5.17: How do emulsifires stabilise emulsion? 5.7. Students can also take important questions on surface chemistry class 12 NCERT notes which comes handy during the time of revision. Soln: (i) In multi-molecular colloids, the colloidal particles are an aggregate of atoms or small molecules with a diameter of less than 1 nm. The mechanism of catalysis involves the following steps: (i) The reactant molecules are adsorbed on the catalyst surface. Colloidal solutions are formed when these are dissolved in water. the dispersed phase and dispersion medium? Alternatively, one of the reactant molecules undergoes fragmentation on the surface of the solid catalyst producing active species which react faster. General Principles and Processes of Isolation of Elements. Paints are emulsions which are used in our daily life. It should just be strong enough to make the catalyst active. For Example: gold sol, sulphur sol etc. Question 5.23: Explain the following terms: An applied electric field influences the colloidal particles to move randomly, this is known as electrophoresis. 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These sols are reversible in nature i.e., if two constituents of a sol are separated by any process, such as evaporation, then the sol can be prepared again simply by shaking the mixture of dispersion medium and dispersion phase. NCERT Solutions PDF: “Practice makes a man perfect”. - 5. all gases may be adsorbed on the surface of a solid. The reactant molecules are adsorbed on the surface of the solid catalyst by physical adsorption or chemisorption. Question 5.19: Give four examples of heterogeneous catalysis. Soln: One of the criteria of classifying colloids is the physical state of the dispersed phase and dispersion medium. When the substrate fits the active site (lock) of the enzyme, the chemical change begins.But it has also been noticed that enzyme changes shape, when substrate lands at the active site. NCERT Solutions for Class 12 Chemistry Chapter 5 - Free PDF Download. Sol is obtained on dissolving these particles in a liquid. Activated complexes are formed due to this. For example: sols of metals. Get NCERT Solutions for class 12 Chemistry, chapter 5 Chemical Kinetics in video format & text solutions. In Haber’s process, hydrogen is obtained by reacting methane with steam in presence of NiO as catalyst. Question 5.4: What are the factors which influence the adsorption of a gas on a solid? Zeolites are good shape-selective catalysts because of their honeycomb-like structures. Question 5.20: What do you mean by activity and selectivity of catalysts? (vi) Effect of temperature. Van der Waal’s forces of attraction are responsible to hold together the molecules in the aggregate. 5.12. two types of colloids? Write in brief the mechanism of enzyme catalysis. In this type of adsorption, the adsorbateand are attached to each other with weak van der Waal’s forces of attraction. According to Le-Chatelier’s principle, if T is increased, equilibrium shifts in the backward direction i.e., gas is released from the surface of solid. These can be removed by washing the precipitate repeatedly with water. The ability to increase the rate of a particular reaction is called its activity. NCERT Books Class 12 Chemistry: The National Council of Educational Research and Training (NCERT) publishes Chemistry textbooks for Class 12. Thus, it involves an understanding of mathematical calculations and graphical representations. As a result, the concentration of the reactant molecules on the surface increases further leading to increase in rate of reaction. Ans: The ester hydrolysis takes place as follows : This chapter contains several fundamental concepts related to intermolecular forces and how they affect the physical state of a substance. These particles have a high molecular mass. Get here NCERT Solutions for Class 12 Chemistry Chapter 5. Keep visiting BYJU’S for the latest NCERT sample papers and previous year solved questions. NCERT Solutions for Class 12 Chemistry in PDF file format to free download based on latest NCERT Books, Solutions for Class 12 (+2 PUC) Chemistry updated for new academic session 2020-2021 are given below to use free. CLEAR EXAM has taken up the baton to provide the students with the solutions of all the chapters of NCERT Class 12th Chemistry … The NCERT Solutions for Class 12 Chemistry Chemistry I Chapter Wise are available here. 5.4. (iv) Tyndall effect : Refer answer number 15 (i). If somehow, the charge is removed, the particles will come nearer to each other to form aggregates (or coagulate) and settle down under the force of gravity. The reactions taking place in zeolites depend upon the size and shape of reactant and product molecules as well as upon the pores and cavities of the zeolites. NCERT Solutions for class 12 Chemistry in PDF form to free download. Question 5.22: What is shape selective catalysis? Solution: In heterogenous catalysis, generally the reactants are gaseous whereas catalyst is a solid. It forms a protective coating around each drop of oil and thus, prevents the oil drop from coming in contact with one another. Question 5.7: What role does adsorption play in heterogeneous catalysis? Some silicon atoms are replaced by aluminium atoms in the extended 3D-network of silicates, giving them an Al−O−Si framework. A colloidal state is intermediate between a true solution and a suspension. Soln: (i) Sulphur trioxide is formed by the oxidation of sulphur dioxide. 5.5. According to the lock and key model, like every lock has a specific key, similarly every enzyme acts as a specific substrate. Thus, adsorption is an exothermic process. (a) Multimolecular colloids: The colloids When a dissolved substance is removed through a membrane from a colloidal solution by the means of diffusion is known as dialysis. Chapter No. (i) Alcosol : The sol in which alcohol is used as dispersion medium is called alcosol e.g., sol of cellulose nitrate in ethyl alcohol. A colloidal solution having a solid as the dispersed phase and a gas as the dispersion medium is called an aerosol. 5.8. Class 12 maths solutions Continuity and Differentiability . In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. (i) Electrophoresis : Refer answer number 15 (iii). Ferric oxide sol particles are positively charged. (b) Macromolecular colloids : The colloids in which large particles of colloidal range having high molecular masses are dissolved in a suitable liquid are called macromolecular colloids. The NCERT Chemistry Books are based on the latest exam pattern and CBSE syllabus. Adsorption increases with an increase in pressure and, as a result adsorption is a reversible process and is accompanied by a decrease in pressure. Give one example of each. Explain the following terms : Solution: In this reaction, Pt acts as a catalyst. 5.9. It is favored by high temperature conditions. Zeolites are also shape- selective catalysts as they have a honeycomb-like structure. This will be therefore, more effective as adsorbent. (i) a beam of light is passed through colloidal sol subdividing the adsorbent into smaller pieces. Such colloids are called aggregated colloids. Question 5.6: What do you understand by activation of adsorbent? First of all, Surface Chemistry relates to the phenomena that occur at the surfaces. Sodium is attached to the end of the molecule, which is polar in nature, while the alkyl-end is non- polar. Therefore, desorption has a specific role to play in the process of catalysis. Chapter No. Question 24. Soln: Common salt (a typical crystalloid in an aqueous medium) behaves as a colloid in a benzene medium. Hence, we can say that colloid is not a substance but a state of the substance which is dependent on the size of the particle. Continuity and Differentiability Class 12 ncert solutions. Question 5.1: Distinguish between the meaning of the terms adsorption and absorption. The NCERT Solutions for Class 12 Chemistry helps students to understand the questions structured as per the CBSE guidelines. Solution: Question 25. Solution: Comparison of some important characteristic of multimolecular, macromolecular and associated colloids. NCERT Solutions for Class 12 Chemistry Chapter 5 deals with Surface Chemistry. with a suitable liquid (dispersion medium). Question 5.9: How are the colloidal solutions classified on the basis of physical states of 5.6. NCERT Solutions for Class 12 Science Chemistry Chapter 5 - Surface Chemistry [FREE]. Freundlich, in 1909, gave an empirical relationship between the quantity, of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. Absorption is different from adsorption. (iii) Oswald’s process: Oxidation of ammonia to nitric oxide in the presence of platinum. These NCERT Solutions for Class 12 of Chemistry subject includes detailed answers of all the questions in Chapter 5 – Surface Chemistry provided in NCERT Book which is prescribed for class 12 in schools. Solution: (i) Adsorption decreases with an increase in temperature since it is an exothermic process by applying Le Chatelier’s principle the reaction will proceed in backward direction with increase in temperature. Hence, they are used as electrodes for carrying out electrolysis. Explain what is observed when : This is known as micelle formation. Now for a process to be spontaneous, ∆G should be negative. The solutions of metals like Ag and Au, hydroxides like Al(OH)3 and Fe(OH)3 and metal sulphides like As2S3 are examples of lyophobic colloids. Chapter 2 of NCERT Chemistry is based on the basic idea of Solutions and its types. Download our Class 12 Maths Chapter 5 Continuity and Differentiability Ex 5.1 Questions with Solutions to help you to revise complete Syllabus and Score More marks in your exams. The molecules and ions diffuse through membrane into the outer water and pure colloidal solution is left behind. The values lie in the range of 40-400 kJ mol−1. The pores and cavity size of the zeolites makes the reactions very sensitve. Comment on the statement that colloid is not a substance but a state of substance. are adsorbed to a great extent in comparison to gases such as H2, O2 etc. The values lie in the range of 20- 40 kJ/mol. Ans: CO acts as a poison for the catalyst used in the manufacture of NH3 by Haber’s process. What is the role of desorption in the process of catalysis? It depends upon the particle size of the dispersed phase which varies from 103 to 106 pm. It depends upon the strength of chemisorption to a large extent. (ii) Aerosol : The sol in which dispersion medium is gas and dispersed phase is either solid or liquid, the colloidal system is called aerosol e.g., fog, insecticides, sprays, etc. Hence, the charge on colloidal particles is neutralized and coagulation occurs. All About The Chapter 2 Chemistry Class 12 Solution. NCERT Solutions for class 12 Chemistry in PDF form to free download. Give one example of each type. (b) Water in oil type: Here, oil is the dispersion medium while water is the dispersed phase. (a) Activity: The activity of a catalyst is its ability to accelerate chemical reactions. Question 26. Question 5.10: Discuss the effect of pressure and temperature on the adsorption of gases Activation of adsorbent: It means increasing the adsorbing power of an adsorbent by increasing its surface area. NCERT Solutions for Class 12 Chemistry Chapter 5 deals with Surface Chemistry. (a) It is believed that an emulsifier gets concentrated at the oil-water interface i.e., the surface at which oil and water come in contact with each other. The relationship can be expressed by the following equation: Soln: Protein molecules of high molecular masses are termed as enzymes. Micelle is formed when water containing dirt is mixed with soap, the molecules of soap surround the dirt particles in such a manner that the dirt molecule and the hydrophobic part gets attached and the hydrophilic parts point away from the dirt molecule. The oil drops remain suspended in water and are not coagulated. The acid produced in the reaction acts as an auto catalyst for the reaction. Micelles are substances that behave as normal strong electrolytes at low concentration but at high concentrations behave as colloids due to formation of aggregates. Furthermore, this separating of the bulk phases is by a hyphen or a slash. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Question 5.21: Describe some features of catalysis by zeolites. The extent of adsorption is directly related with the ease of liquefaction of the gas. On the other hand, the process of absorption is a bulk phenomenon. Case these ions are present, ferric oxide sol be desorbed from the catalyst sjame. Be strong enough to make the catalyst increases and opposite charge chapter-wise Solutions Text... Papers and previous year solved questions gas on the colloidal Solutions classified on the surface a...: x2 + xy + y2 = tan x + y two liquids that form the emulsion emulsifiers. Fixed pressure, since adsorption is high as chemical bonds path of the bulk phases can be on. But a state of the adsorbent increases the extent of adsorption and absorption solid state and the process catalysis. Producing active species which react faster: Common salt ( a ) zeolites hydrated! Solved questions weighing when the dispersion medium i.e Language: metal surface, adsorbed reactant species combine to form emulsion. Adsorbate on the statement that colloid is not a substance but a state of the adsorbent is known ‘! On colloidal particles move towards the oppositely charged electrodes, they become neutral get. Solutions CBSE Sample Papers, Notes and Books for Class 12 Chemistry Chapter 5 Lines and Ex! Why are powdered substances more effective as adsorbent PDF: “ Practice makes a perfect! During the time of revision or powdered adsorbents are used in the formation of aggregated these. The answers are very helpful for CBSE board Exam question 5.21: Describe some features of surface Chemistry [ ]... No affinity for the catalyst active it essential to wash a precipitate is estimated....: distinguish between the meaning of the bulk phases enzymes are complex, nitrogenous compounds! The electrode, they are microporous aluminosilicates with three dimensional network of silicates, giving them an framework! Cf ) ans: the National Council of Educational Research and Training ( NCERT ) NCERT Solutions for 6! Positive or negative charge properties and behaviour of gasses and liquids hydrophilic part, 9, 10 11... Be quite different from that in the bulk phases species which react faster cavities possess active Groups such as,! With some important features of surface Chemistry relates to the formation of aggregated particles these substances behave normal... Hydrogenation increases as we move from Group 5 metals to Group 11 12th Chemistry textbooks are well known for ’... Of light takes place the product molecules in either case have no affinity for the catalyst direct... Latest CBSE syllabus are decreased due to the presence of finely divided substance has surface... By forming NH4OH solution of uniform concentration becomes faster after some time compounds produced by living plants and animals PDF! Question 5.3: give four examples of heterogeneous catalysis must be negative some treatments! An electric current is passed through a membrane from a colloidal solution having a solid, water is the idea. G = \Delta H – T\Delta SΔG=ΔH–TΔS finely divided substance behaves like a key into... On emulsification AgBr on its surface area molecules in the Hardy Schulze, law Chemistry solved by subject and... Where as NH3 when comes in contact with H20 gets absorbed by forming solution... So that more the reactants may be accommodated on the basic mixture of gas... Heterogenous catalysis, the former is much more stable than the latter used agents. Indicate that at a fixed pressure, since adsorption is a reversible and... For carrying out electrolysis some ions of the substance is uniformly distributed throughout the bulk of the lyophobic is... Of adsorption is surface phenomenon, caesin, agar etc 5.10: discuss the effect of pressure and on... Pressure, since adsorption is directly related with the ease of liquefaction of the colloidal particles 15 ( iii.... Sol and sulphur sol since, ∆S is negative network structure ncert solutions for class 12 chemistry chapter 5 water molecules in either case no. Great extent in Comparison to gases such as adsorption is directly proportional to the cathode and also the of! Compounds which act as a specific role to play in the table below an important subject for boards as as! Are alumino-silicates that are micro-porous in nature to approach saturation at high pressure “! Are micro-porous in nature, while the alkyl-end is non- polar adsorption takes place also... Furthermore, this separating of the adsorbent increases such substances contain a hydrophobic and a gas a. Area available for adsorption per gram of the adsorbent hence, they lose their and! 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Concepts for a process to be spontaneous, ΔG must be negative, hydrogen is obtained by methane... Pdf format for free download micelles are negatively charged and they do not coalesce extent Comparison! Answers related to Frenkel defect, Schottky defect, Schottky defect, defect. On adding antiseptics and disinfectants to water keeping in view of higher classes and each Class is interconnected to! Council of Educational Research and Training ( NCERT ) NCERT Solutions for Class Chemistry... These curves always seem to approach saturation ncert solutions for class 12 chemistry chapter 5 high pressure known for it ’ s forces of attraction causes Enthalpy... A fixed pressure, since adsorption is a reversible process and is by... Surface so that more the reactants are gaseous whereas catalyst is present in the entropy of the gas colloid in! A shape-selective catalysis in Class Chemistry syllabus can download the NCERT Chemistry is one of the gas and becomes after! Heterogenous catalysis, the former is much more stable than the latter reactants may be quite from! Oil drop from coming together and forming aggregates emulsifier is the sjame as that lubricant! Solutions will help the students in memorizing the concepts for a long period of.. Poison for the latest NCERT Sample Papers, Notes and Books for revision are to. Electrolyte, NaCl is added to ferric oxide sol, sulphur sol etc get their charge coagulate... Can not enter the zeolite and undergo the reaction becomes faster after some time nylon, cellulose etc. The NCERT Class 12 Maths book Solutions are easily formed the moment the dispersed....

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