Tag: Chemistry

पृष्ठ रसायन :अधिशोषण क्या है ?(Surface Chemistry :Adsorption Theory)

अधिशोषण किसे कहते है – adhishoshan ki paribhasha: जल वाष्प से भरे पात्र में सिलिका जैल लटकाने पर उसकी सतह पर जल वाष्प संचित हो जाती है इसे अधिशोषण कहते है। अतः ठोस या द्रव की सतह पर दूसरे पदार्थ का संचित होना अधिशोषण कहलाता है। विशेष: वह पदार्थ जो ठोस या द्रव की सतह पर संचित होता है उसे अधिशोष्य…

Surface Chemistry Class 12 Notes Chemistry Chapter 5

1. This phenomenon of attracting and retaining the molecules of a substance by a solid (or a liquid) on its surface resulting into a higher concentration of the molecules on the surface is known as adsorption.2. The substance that is adsorbed is called adsorbate and the substance which adsorbs is called adsorbent.3. Desorption is a process of removing an adsorbed substance from a surface on which it is…

Important Questions on Vectors(सदिश राशियाँ: महत्वपूर्ण प्रश्न)

प्रश्न 1. अदिश राशियाँ क्या हैं ? उत्तर- वे राशियाँ जिनमें केवल परिमाण होता है, दिशा नहीं होती है, अदिश राशियाँ कहलाती हैं। जैसे- द्रव्यमान, लम्बाई, आयतन, घनत्व, समय, ऊष्मा, कार्य, ऊर्जा, विद्युतधारा, आवेश आदि। प्रश्न 2. सदिश राशियाँ क्या हैं ? उत्तर- वे राशियाँ जिनमें परिमाण और दिशा दोनों होते हैं, सदिश राशियाँ कहलाती हैं। जैसे- बल, वेग, त्वरण,…

Chemical Kinetics: Quick Revision

Chemical kinetics: The branch of chemistry deals with the rates of reactions, the factors that influence it, and the mechanism by which the reaction occurs. Rate of reaction: It is the speed with which the reactants art converted into products. It may be expressed in terms of the rate of any of the products. It may be represented in terms…

Matter, Energy, Dark Matter and Dark Energy.

Besides life, matter and energy are regarded as the two fundamental entities with which whole universe is composed of. You can see the life in the form of living organism like animals and human beings. Life is also possible only in the presence of matter and energy. What is Matter ? Matter is anything that has mass and occupies space.…

Chemistry And It’s Scope

Chemistry is the branch of physical science which deals with the study of matter, its physical and chemical properties, its chemical composition, the physical and chemical changes which it undergoes and the energy changes that accompany these processes. All the objects in this universe are composed of matter. Most of these objects are visible but some are invisible. Why chemistry…

Solid state most important questions for board and jee exam-Part-1

Why do we study solid state chemistry? To obtain the knowledge on design and development of materials with pre-required properties based on understanding the structure of solids in its influence on physical-chemical properties, understanding of phase relations, chemical synthesis, reaction kinetics as well as characterisation methods. What is the fundamental concept in solid state chemistry? A solid is a material in the solid state. Solid state chemistry is the branch…