Soul of Chemistry

  Solutions of Gateway Examinations to  IISER, NISER, JEE, NEET,   NDA, ICAR, OUAT Topic: Solution (NDA, ICAR, OUAT Level) 1. Solubility of a gas in a solvent varies directly with the prssure of the gas, inversly with the temperature of the solution and directly with the liquefiability of a gas. So all of the above are true. 2.  Calculate the amount of urea dissolved per litre if its aqueous solution is isotonic with 10% cane sugar solution. Isotonic Solutions are those having equal osmotic pressure (O.P). O.P = w R T / m V In case of Urea, w1 = ?, m1 = 60, V1 = 1 litre In case of Cane sugar, w2 = 10g, m2 = 342, V2 = 100ml = 0.1 litre Thus w1 R T / m1 V1 = w2 R T / m2 V2 Or w1 / m1 V1 = w2 / m2 .V2 Thus w1 = 17.543 g = 17.6 g 3.  If we prepare separate solutions of 2 mole urea and 2 moles NaCl in one litre water, then whose boiling point will be higher? Number of particles in NaCl solution will be greater due to ionisation hence the value of any colligative properties will be higher

  Gateway Examinations  On Various Topics of Chemistry  to  IISER, NISER, JEE, NEET,  NDA, ICAR, OUAT You need to prepare strategically, to get success in these high profile examinations. Getting concept, understanding formula, knowing deep of everything, finding shorcut answer for time management, constant effort, perseverance and feeling relaxed in the examination hall are all of equal importance.     Above all, appearing in series of equivalent mock tests is mostly necessary which will enhance your ability and confidence to crack the examinations.     Wishing you best of your ability and fortune for the upcoming examinations. Click on th links below to appear in the examinations: Click here for the exam topic: Solution   (OUAT, NDA and ICAR Level) Click Here for the Exam on Chemical Kinetics   (OUAT, NDA and ICAR Level) Click here to appear in the exam topic: Chemical kinetics - 2 (OUAT, NDA and ICAR Level) Click here to get the answers

States of Matter: Gateway to JEE (Main), NEET, ICAR, OUAT and All Similar Entrance Examinations      You need to be friendly with concepts and problems, before appearing any entrance examinations. A systematic flow of concepts and corresponding problems will build your confidence to crack entrance examinations. This gateway will help you rise step wise to reach and crack the entrance examinations. Pratap Sir's Core Concept of States of matter (PSCC: 1): Ideal Gas Equation This equation though applicable to hypothetical ideal gasses, it can be applied to real atmospheric gasses like oxygen, nitrogen, methane etc with little to no error at particular conditions like high temperature and low pressure.     This equation contains all gaseous variables like pressure, temperature, volume and number of moles, given by the formula:  PV = nRT = (w/m) RT ........ eq. 1 where n =  number of moles = given mass (w) / molecular mass (m) .  R = Universal gas constant,  the value of which  depends

 Concepts of chemical equilibrium greatly expected  to be asked in JEE Main As the JEE Main grows older, it asks more and more tricky questions. To be able to solve chemistry questions asked in JEE Main, one must get all important concepts cleared and  analyse previous year question papers. The ability to grasp the data given in the question and find appropriate formula or path to find the answer is frankly achieved through problem solving. The level of questions asked in JEE Main is the next important thing to realise. Here are the summary of concepts and questions asked from chemical equilibrium in the previous years, so that it will be easy to take a conclusion. (Though you will find little easier questions asked in 2020 due to corona pandemic...) Rate vs. Time graph w.r.t. Equilibrium: 1.  Q: (04/09/20 Morning)  For the equilibrium A  ⇌  B, the variation of the rate of the forward reaction (a) and reverse reaction (b) with time is given by: Solution:  Characteristics of chemical eq