Author: Dr. Vikas Jasrotia

Equilibrium Notes Class 11 Equilibrium Notes Class 11 An Equilibrium represents the state of a process in which the properties like temperature, pressure, the concentration of the system does not show any change with the passage of time “Equilibrium is the state at which the concentration of reactants and products do not change with time. i.e., concentrations of reactants and products become constant.” Types: Equilibrium in a system implies the existence of the following types of equilibria simultaneously, (i) Physical equilibrium: It is the process that involves physical changes only, like an equilibrium between different states of substances at a…

Chemistry Questions with Surprising Answers Chemistry Questions with Surprising Answers Que 1. What does it mean if a mixture is heterogeneous? Ans 1. We can see the different parts. Que 2. One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body? Ans 2. The average adult human body contains about 250 grams of salt, which is just over half a pound. Que 3. What is the name of the first Noble Gas? Ans 3. Helium. Que 4. What is the center of an atom called? Ans 4. Nucleus Que 5. Only…

What are enzymes? Write in brief What are enzymes? Write in brief Que. What are enzymes? Write in brief the mechanism of enzyme catalysis. Ans. Enzymes are protein molecules of high molecular mass and form colloidal solutions in water. These are present in plants and animals and behave as biochemical catalysts or biocatalysts. Enzymes catalyze reactions occurring in human beings. Mechanism of enzyme catalysis: A number of cavities are present on the surface of colloidal particles of enzymes. These cavities are of a characteristic shape and possess active groups like -NH2, -COOH, -SH, -OH, etc. These are actually the action…

Structure of Atom Class 9 – Science Chapter 4 Structure of Atom Class 9 Structure of Atom The term atom was introduced by Dalton and is defined as the smallest particle of an element that retains all its properties and identity during a chemical reaction. SUB – ATOMIC PARTICLE (i) Discovery of Electron Electron was discovered by J J Thomson through the Cathode ray discharge tube experiment. A cathode-ray tube is made of glass containing two thin pieces of metal (called electrodes) sealed in it. The electrical discharge through the gases could be observed only at very low pressures and…

Comparative Account of the Alkali and Alkaline Earth Metals Que. Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics: (i) Tendency to form ionic/ covalent compounds (ii) Nature of oxides and their solubility in water (iii) Formation of oxo-salts (iv) Solubility of oxo-salts (v) Thermal stability of oxo-salts Ans. Following is the comparative results of alkali and alkaline earth metals for various properties mentioned in the question (i) Tendency to form ionic/covalent compounds : (a) All common compounds of alkali metals are generally ionic in nature. Halides and oxides are ionic in…

Chemistry Class 12 Syllabus (Term – 2) Chemistry Class 12 Syllabus Class 12 Chemistry Syllabus (Term – 2) for session 2021-22 is given below for the students along with the number of marks for each branch of chemistry. Class 12 Chemistry Syllabus is very important for the upcoming examinations. It is important for the students to go through the Class 12 Chemistry Syllabus (Term – 2). Unit No. Unit Name Periods Branch Marks 3 Electrochemistry  7 Physical Chemistry 13 4 Chemical Kinetics  5 5 Surface Chemistry 5 8 d & f – Block Elements 7 Inorganic Chemistry 9 9 Coordination…

Coordination Compounds NEET Questions PDF – Class 12 Chemistry Coordination Compounds NEET Questions PDF 1. The bond between central metal ion and ligand in a complex compound. a) Coordinate covalent b) Covalent c) Metallic d) Ionic Ans 1. a) Coordinate covalent 2. When 0.1 mol CoCl3(NH3)5 is combined with excess AgNO3, then 0.2 mol AgCl is obtained. The conductivity of the solution suits the a) 1:3 electrolyte b) 1:1 electrolyte c) 3:1 electrolyte d) 1:2 electrolyte Ans 2: d) 1:2 electrolyte 3. The complex compounds which result from the coordination of carbon monoxide are known as a) Electronic b) Carbonyls…

Carbon and Its Compounds Extra Questions Carbon and Its Compounds Extra Questions Que 1. What would be the electron dot structure of carbon dioxide which has the formula CO2? Ans 1. The electron dot structure of Carbon Dioxide (CO2) is Que 2. Why the bottom of the vessel is getting blackened on the outside, during cooking? Explain. Ans 2. The bottom of the vessel is getting blackened on the outside because there is not enough oxygen to react with the carbon to produce carbon dioxide, then the unburnt carbon particles are left behind in the form of black particles known…

Chemical Reactions and Equations Class 10 MCQ With Answers Chemical Reactions and Equations Class 10 MCQ With Answers Que 1. The reaction of ‘magnesium’ with air is (a) Exothermic reaction (b) Endothermic reaction (c) Reversible reaction (d) Substitution reaction Ans 1. (a) Exothermic reaction Que 2. Magnesium ribbon is rubbed before burning because it has a coating of (a) Basic magnesium carbonate (b) Basic magnesium oxide (c) Basic magnesium sulphide (d) Basic magnesium chloride Ans 2. (a) Basic magnesium carbonate Que 3. Sodium and chlorine are reacted and as a result, sodium chloride is formed which is also called table…

Electrolysis of an Aqueous Solution of CuSO4  Que. What will happen during the electrolysis of an aqueous solution of CuSO4 in the presence of Cu electrodes? (A) Copper will deposit at cathode (B) Copper will dissolve at the anode (C) Oxygen will be released at the anode (D) Copper will deposit at the anode Ans. Option (A) and (B) is correct. Explanation: Electrolysis of CuSO4 can be represented by two half-cell reactions these occurring at cathode and anode, respectively, as given below At cathode: Cu2+ + 2e– → Cu(s) At anode: Cu(s) → Cu2+ + 2e– On dissolution of CuSO4 in…