Author: Dr. Vikas Jasrotia

Periodic Classification of Elements Class 10 Periodic Classification of Elements Class 10 With the discovery of a large number of elements, it became difficult to study the elements individually, so the classification of elements was done to make the study easier. Earlier Classification: Dobereiner’s Triads: In the year 1817, Johann Wolfgang Döbereiner, a German chemist, tried to arrange the elements with similar properties into groups. In triads, the atomic mass of the middle element is approximately the average of the other two elements. This is known as the Law of Triads. This classification was applicable to very few elements and…

Surface Chemistry Multiple Choice Questions pdf Surface Chemistry Multiple Choice Questions pdf Que 1. What is the emulsifier in milk? (a) albumin                                                     (b) soap (c) gelatin                                                       (d) casein Ans: (d) Reason: An emulsifier is an additive that helps two liquids mix. Que 2. Which one of the following gases will be adsorbed most easily? (a) N2                          (b) H2                          (c) O2                          (d) CO2 Ans: (d) Reason: Higher is the critical…

MCQ on Electrochemistry Class 12 with Answers MCQ on Electrochemistry Class 12 with Answers Que 1. When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are Cathode                                  Anode (a) Pure zinc                            Pure copper (b) Impure sample                  Pure copper (c) Impure zinc                       Impure sample (d) Pure copper                       Impure sample Ans 1. (d) Reason: Impure metal made anode while pure metal made cathode Que 2. In the electrolytic cell, the flow of electrons is from (A) Cathode to the anode in the solution (B) Cathode to the anode through…

Solutions Chemistry Class 12 MCQ Que 1. If sodium sulphate is considered to be completely dissociated into cations and anions in an aqueous solution, the change in freezing point of water(∆Tf ), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kg mol-1) (A) 0.0372 K                                                              (B) 0.0558 K (C) 0.0744 K                                                              (D) 0.0186 K Ans 1. (B) Reason: Van’t Hoff factor (i) for Na2SO4 = 3 ΔTf = i Kf m = 3 × 1.86 × 0.01 = 0.0558 Que 2. The vapour pressure of…

MCQs Solid State Class 12 Chemistry Que 1. The total number of tetrahedral voids in the face-centered unit cell is (a) 6                            (b) 8                            (c) 10                           (d) 12 Ans 1. (b) 8 Reason: No. of atoms per unit cell in face-centered unit cell = 4 We know for N atoms there are 2 N tetrahedral voids ∴ No. of tetrahedral voids = 2 × 4 = 8 Que 2. A compound is formed by cation C and anion A. The anions form hexagonal close-packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the…

CHEMISTRY SYLLABUS CLASS XI SESSION 2021-22  (Term-I) S.NO. UNITS SYLLABUS Marks 1. Some Basic Concepts of Chemistry General Introduction: Importance and scope of Chemistry. Atomic and molecular masses, mole concept and molar mass, percentage composition, empirical formula and molecular formula, chemical reactions, stoichiometry, and calculations based on stoichiometry. 11 2.  Structure of Atom Bohr’s model and its limitations, the concept of shells and subshells, dual nature of matter and light, de Broglie’s relationship, Heisenberg uncertainty principle, the concept of orbitals, quantum numbers, shapes of s, p, and d orbitals, rules for filling electrons in orbitals – Aufbau principle, Pauli’s exclusion…

To get PDF scroll down Chemistry Syllabus Class XII for the Session 2021-2022 (Term – 1) Chemistry Syllabus Class XII Session 2021-2022 (Term – 1) CHEMISTRY CLASS XII TOTAL SYLLABUS IN NCERT TEXTBOOK CHEMISTRY TERM-WISE SYLLABUS TERM – I (2021-22) DELETED PORTION FOR TERM – I 2021-22 UNIT – 1 SOLID STATE: Classification of solids based on different binding forces: molecular, ionic, covalent, and metallic solids, amorphous and crystalline solids (elementary idea). Unit cell in two-dimensional and three-dimensional lattices, calculation of density of unit cell, packing in solids, packing efficiency, voids, number of atoms per unit cell in a…

Environmental Chemistry Class 11 Environmental Chemistry class 11 chapter contains all important topics involved. The topics covered are mentioned below (i) ENVIRONMENTAL CHEMISTRY (ii) ENVIRONMENTAL POLLUTION (iii) ATMOSPHERIC POLLUTION (a) Tropospheric Pollution (b) Stratospheric Pollution ……………………………………………………………………………………………………………… (i) ENVIRONMENTAL CHEMISTRY It is the study of chemical processes that occur in water, air, terrestrial and living environments, and the effects of human activity on them. OR Environmental Chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places. Environmental Chemistry is an interdisciplinary science that includes atmospheric, aquatic, and soil chemistry, as well as heavily relying on analytical…

Electromeric Effect An Electromeric effect is a temporary effect that takes place between two atoms joined by multiple bonds for means a double or triple bond. When the charged reagents like electrophiles or nucleophiles approach them, the electrons get polarized and displaced towards one of the constituents of the atom. The electromeric effect is a reversible reaction where there is a complete transfer of a pi-electron pair due to the influence of an electrophile or a nucleophile. The effect disappears upon withdrawal of the attacking reagent. Electromeric Effect Types of Electromeric Effects The electromeric effect can be broken down…

Cabinet Ministers of India 2021 S.No. Name Ministry Shri Narendra Modi Prime Minister 1. Ministry of Personnel, Public Grievances, and Pensions 2. Department of Space 3. Department of Atomic Energy 4. All important policy issues and all other portfolios not allocated to any Minister  Cabinet Ministers of India Cabinet Ministers 1.  Shri Amit Shah 1. Ministry of Home Affairs 2. Ministry of Cooperation 2.  Shri Rajnath Singh 1. Ministry of Defense 3.  Shri Nitin Jairam Gadkari 1. Ministry of Road Transport and Highways 4.  Shri Narayan Tatu Rane 1. Ministry of Micro, Small and Medium Enterprises 5.  Smt. Nirmala Sitharaman 1. Ministry…