JEE Main Study Notes for Surface Chemistry: Surface Chemistry is the study of the type of surface and the species present on it. Through surface chemistry, we study the chemical changes which are taking place at the interface of two phases which can be solid-liquid, solid-gas, liquid-gas, etc. There are various applications of surface chemistry in the medical field, analytical field, paint industry, etc.
Surface engineering refers to some applications of surface chemistry. A variety of phenomena occurs on the surface of substances, including Adsorption, Heterogeneous Catalysis, Corrosion, and Crystallization. The topic of surface chemistry has a minimum of 1 question in JEE Main.
JEE Main Study Notes for Surface Chemistry include some important topics such as types of adsorption, adsorption isotherm, applications of adsorption, catalysis, enzyme catalyst, colloids, emulsions, etc. Candidates will find detailed information about JEE Main Surface Chemistry Study Notes in this article. Check JEE Main Chemistry Syllabus
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Surface chemistry is defined as the detailed study of surfaces and interfaces.
There are two types of phenomena that can be commonly seen in this topic which is
ADSORPTION and ABSORPTION; let's take a look upon both of the phenomena
ADSORPTION: When any substance stays on the surface of the substance then it is known as adsorption. The species which is going to adsorb is known as adsorbent and the surface onto which it takes place is known as the adsorbate. For example, silica gels, clays are the most commonly seen substance that possess adsorption qualities.
There is a process known as desorption also which is known as the removal of the adsorbed substance from the surface of an element.
ABSORPTION: When the substance fully penetrates inside the surface is known as absorption. The most common example of it is soaking cloth in the water. The water then penetrates into the cloth piece and we can say that the absorption process is occurring there.
An example of solid sol is?
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ABSORPTION | ADSORPTION |
---|---|
Substance penetrate fully | The substance remains onto the surface only. |
It is an endothermic process | It is the exothermic process |
It occurs at a uniform rate | The rate goes from increasing to decreasing |
It is unaffected by the temperature | It is affected by the temperature |
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There are mainly two types of adsorption are there namely physisorption and chemisorption.
It involves adsorption of gases on the solid surface via weak van der Waal’s forces.
Characteristics: There is no specificity in case of physical adsorption.
When the gas molecules or atoms are held to the solid surface via chemical bonds, this type of adsorption is chemical adsorption or chemisorption.
Characteristics of Chemical Adsorption:
Haemoglobin and gold sol are examples of:
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It is the graphical representation of the amount of adsorbent adsorb on the surface/adsorbate in relation to the pressure and constant temperature.
x/m= k. p1/ n
where (n > 1)
x is the mass of the gas adsorbed, m is the mass of the adsorbent, p is the pressure, k and n are constants that depend on the nature of the adsorbent and the gas at a particular temperature. Taking the log of the above equation, the following equation will be observed
log x/m = log k +1/n log p
Then the graphical representation is made accordingly to the equation mentioned above.
It is the process occur when the potassium chlorate decomposes into the potassium chloride and oxygen at the temperature of about 650-870K, but by adding magnesium dioxide the rate of reaction becomes faster and no need of high temperature is required there then it is known as the catalysis process occur there. This process is generally useful by fastening up the chemical reaction and in the short duration of the time.
Important features of the catalysis process:
These are known as a biochemical catalyst which is complex and organic in nature and are obtained from plants and animals. For example Invertase; it converts sucrose into fructose and glucose.
Characteristics of enzyme catalyst:
This is known as the heterogeneous system in which one substance is dispersed due to the very fine nature of it, it can mix well in the dispersion medium. This process has two kinds of activities going on known as;
Properties of the colloidal solution:
Among colloids cheese, milk and smoke, the correct combination of the dispersed phase and dispersion medium is:
Ans:
Two liquids colloidal systems form an emulsion. These are of two types:
Hence, these above-mentioned notes will give the basic idea about the surface chemistry topic and helps a student preparing for IIT exam to strengthen his/her base.
Chemistry is a mixed subject, which means it contains both theoretical and practical based problems. Thus in order to achieve good marks, a student needs to practice upon both the skills. Students must take a look at some points before preparing for the exam which are:
Week | Activity |
---|---|
Week 1 (May 13 – May 20, 2022) | Physical Chemistry bears the most weightage in JEE Main Chemistry. High-weightage chapters from this area such as Electrochemistry, Atomic Structure, and Equilibrium to be studied in the beginning. Then, study less important chapters like Surface Chemistry and Solid State. Pick two chapters each day and study all the essential concepts and reactions. |
Week 2 (May 21 – May 28, 2022) | Study Organic Chemistry during this week. Allocate more time to chapters with high weightage such as Aromatic Compounds, Alcohol, Alkyl Halides, and Ether. Then, study chapters with lower weightage such as Biomolecules and Carbonyl Compounds. |
Week 3 (May 29 – June 4, 2022) | Study Inorganic Chemistry for this week. Start by studying chapters with the highest weightage like p Block, s Block, and Chemical Bonding. Move on to study less important chapters such as Metallurgy and Qualitative Analysis. |
Week 4 (June 5 to June 12, 2022) | Brush through your study notes, important concepts, and reactions. Answer previous year’s papers for enhanced practice. Pick out questions from the Chemistry section and attempt them as quickly as you can, preferably within 45 minutes to 1 hour. |
Week 5 (June 13 to June 19, 2022) |
Attempt mock tests every day of this week. Revise important concepts and reactions from all the chapters. |
Question: How many questions come from Surface Chemistry in Chemistry in JEE Main?
Answer: Every year minimum of 1 question come on the topic of Surface Chemistry in Chemistry in JEE Main.
Question: What is the adsorption of Surface Chemistry included in JEE Main?
Answer: Adsorption is a surface phenomenon in which atoms, ions or molecules of liquids, gasses, or solids (dissolved) get accumulated at the surface of another substance (which is an indifferent phase) through adhesive forces.
The substance, which concentrates or accumulates at the surface of another substance is termed adsorbate and the material on the surface of which the adsorption takes place is called adsorbent.
Question: What is the marking scheme for the questions on the topic of Surface Chemistry in Chemistry in JEE Main?
Answer: The marking scheme is similar to the other topics of JEE Main Chemistry Syllabus, Candidates will be awarded 4 marks for every correct answer and 1 mark will be deducted for every incorrect answer. Check JEE Main Exam Pattern
Question: What are the important topics of Surface Chemistry in Chemistry included in JEE Main?
Answer: The important topics of Surface Chemistry in Chemistry included adsorption, adsorption isotherm, applications of adsorption, catalysis, enzyme catalyst, colloids, emulsions, etc.
*The article might have information for the previous academic years, please refer the official website of the exam.