Study material CHEMISTRY CLASS: XII KENDRIYA VIDYALAYA SANGATHAN LUCKNOW R E G I O N 2009-2010 Study Material Class XII -Chemistry SHRI RANGLAL JAMUDA IAS‚COMMISSIONER CHIEF Patron KENDRIYA VIDYALAYA SANGTHAN NEW DEHLI SHRI M.S Chauhan Asst. Commissioner Patron Kendriya Vidyalaya Sangthan Lucknow Region SHRI S.S. Rawat Guidance Smt. A.N Siddiqui (Education officer) (Education officer) SHrI K.‚M. Bhatnagar (Education officer) Co-ordinator SHRI. T. Singh Principal K.V. No. 2
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associated with even small amounts of each of the following: a. concentrated hydrochloric acid‚ HCl HCL may be corrosive. It can cause burns to dosy tissue and can be deadly if inhaled or swallowed. b. sodium hydroxide‚ NaOH‚ solution NaOH is a very corrosive chemical and contact with it can cause burns to body tissue and possible eye damage. Can irriate the lungs and can cause permanent lung damage. also contact with water can generate enought heat
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(primary)‚ 2° (secondary)‚ 3° (tertiary) alcohols. Tests such as the dichromate test‚ Tollen’s test‚ Lucas test‚ DNPH test and iodoform test would be very useful in determining the type of alcohol that the unknown sample belongs to. In the experiment‚ the unknown sample underwent series of testing to identify what property of alcohol it belonged to and the result was that it was a primary alcohol. It went through the Dichromate reaction‚ Tollen’s reaction and finally the Lucas reaction. Introduction
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http://www.chem-toddler.com/chemical-equilibrium/chromatedichromate.html http://ibchem.com/IB/ibnotes/full/aab_htm/18.3.htm In the experiment part (i) (a)‚ the solid copper(II) nitrate is used to dissolve in a test tube filled with half distilled water. The solid copper(II) nitrate ionize in water to form copper(II) ions and nitrate ion. Hence‚ a blue solution is formed due to the blue copper(II) ion present in the solution. When excess solid is added‚ the solution will become saturated and
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gases liberated at anode and cathode respectively when an aqueous solution of sodium chloride is electrolysed. 13. Given 2NO(g) + O2 (g) ¾¾ 2NO2(g) ; rate = k[NO]2 [O2]1. By how many times ® does the rate of the reaction change when the volume of the reaction vessel is reduced to 1/3rd of its original volume? Will there be any change in the order of the reaction? 14. Give reasons: i) actinoids show variable oxidation states ii) Zr and Hf have almost identical radii 15. What is Lucas reagent
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The quantity of oxidant consumed is expressed in terms of its oxygen equivalence. Because of its unique chemical properties‚ the dichromate ion (Cr2O72–) is the specified oxidant in Methods Section 5220B‚ Section 5220C‚ and Section 5220D; it is reduced to the chromic ion (Cr3+) in these tests. Both organic and inorganic components of a sample are subject to oxidation‚ but in most cases the organic component predominates and is of the greater interest. If it is desired to measure either organic or
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of ionic compounds. This demonstration is beneficial to use in both the Solution and Solubility‚ and Chemical Reactions units. | Materials | distilled water – saturated sodium bicarbonate (NaHCO3) – 20% sodium carbonate solution (Na2CO3) - phenolphthalein indicator – saturated barium chloride (BaCl2) – sodium dichromate crystals – concentrated hydrochloric acid – water glass – wine glass – milk glass – beer mug | Safety | All chemicals must be handled carefully and with respect. The solids
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet 9701/11 May/June 2012 1 hour *6083199800* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
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brown gas when it was placed in the refrigerator and turned dark brown when it was warmed. Introduction Sodium chromate‚ Na2CrO4‚ is a crystallized powder or yellow crystals. It is soluble to water. It is toxic by inhalation‚ ingestion and/or skin contact. It is a strong oxidizer and absorbs moisture from the atmosphere. Sodium chromate can easily convert to sodium dichromate by treating it with an acid [1]. Copper is a soft‚ orange-brown metal that has been used by humans for years.
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1M = 5.105g = 0.1N | Potassiun hydrogen iodate KH(IO3)2‚ FW = 389.92‚ Eq. 73.07g/l 250ml 0.1M = 9.75g = 0.1N | Sodium carbonate Na2CO3‚ FW = 106‚ Eq. =53g/l 250ml 0.05M = 1.325g = 0.1N | Sodium hydroxide NaOH‚ FW = 40‚ Eq. = 40g/l 250ml 0.1M = 1.0g = 0.1N 1 liter 0.1M soln = 4g = 0.1N | Sodium oxalate Na2C2O4‚ FW = 134.00‚ Eq. =134g/l 250 0.1M = 3.35g = 0.1N | Sodium tetraborate NaB4O7.10H2O‚ FW = 381.37‚ Eq. =190g/l 250ml 0.05M = 4.762g =0.1N | Succinic acid HO2CCH2CH2CO2H
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