Answers for ECAT 2011 by Saad Amjad and Aleem Ullah * Half Life Method can be applied to find the order of any reaction. * Dry Ice has molecular crystals as CO2 is a molecule. * When the Pressure of gas is increased, the molecules come closer to each other and their intermolec ular force of attraction increases. * Aqua Regia is composed of 3 parts HCl and 1 part HNO3. * Oxidation State remains same in a Group and Increases across a period upto an extent, the decreases. * False Statement: Copper is Softer than Sodium. Actually, Sodium is more like a spongy metal whereas Copper is a hard one. * e/ m of Cathode Rays is: 1.7588*1011 & e/m of Canal Rays is 9.638*107. * In pure form, Sulphuric Acid acts as a Dehydratin g agent, it does not conduct electricit y as for that very purpose, dissolutio n in water is required. Moreover, it has a somewhat offensive odour. * Benzene Stability depends upon the resonating pi electronic cloud. * Distributi on Law governs the phenomenon of Solvent Extraction * 1 Molal Solution is more Dilute than 1 Molar Solution because in the former one, total volume of the solution is marked 1dm3 whereas in the latter one, it is more than 1dm3 * 9% increase in volume of water when frozen is due to the empty spaces that arise owing to the Honeycomb Tetrahedra l structure. * In a forward and reversible reaction, change in volume of the Products shifts the Equilibriu m in Forward direction * Catalyst changes the Equilibriu m Position as it causes the activation energy to be gained earlier by the molecules. * Electroche mical Series is used for studying Red-Ox reactions. * Rate of Reaction depends directly upon the surface area of the reacting entities. The more area, the more are the chances of attack by the other reactant.
Posted on: Fri, 16 Aug 2013 05:06:49 +0000
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