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Male / 33 Years From Delhi, Delhi, India

CBSE Board, English Medium
Subject: Physics, Physics, Chemistry Contact for Tution
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Member Since: 11-Jan-2006 4:36 am
Last Login: 16-Aug-2008 12:36 pm
Abhishek Gupta
Dept. of Physics IIT - Delhi... More
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sir, will u plz sent ans for these qns... 10. How do you account for molar conductivity of strong and weak electrolyte with concentration? Plot the graphs also. 11. Explain the Electrophoresis with diagrams. 13.(a) How is nitric acid obtained on large scale by Ostwald process? (b) All the bonds in the molecules of PCl5 are not equal. Why OR (a) H2S is less acidic than H2O. (b) H2O is a liquid and H2S is a gas. 15. (a) Fluorine exhibit oxidation state of –1 only whereas other halogens exhibit +1, +3, +5, +7 oxidation states also. .why (b) Fluorine forms only one oxoacid, HOF (b) There are two – NH2 group in semi carbazide however only one is involved in the formation of semi carbazones. 1. Zn, Cd and Hg are not considered as transition elements. 2. Scandium is a transition element but Zinc is not. 3. Silver atom has completely filled d orbital (4d10) in its ground state, yet it is transition element (b) Write balanced ionic equations for reacting ions to represent the action of acidified Potassium dichromate solution on: (i) Potassium iodide solution [ii] iron (II) solution [iii] H2S (c) The chromates and dichromates are interconvertible in aqueous solution depending upon pH of the solution. 30. (a) Primary alkyl halide C4H9Br (a) reacted with alcoholic KOH to give compound (b).Compound (b) is reacted with HBr to give (c) which is an isomer of (a).When (a) is reacted with sodium metal it gives Compound (d),C8H18 which is different from the compound formed when n-butyl bromide is reacted with sodium .Give the structural formula of (a) and write the equations for all the reactions. 2. (b) An organic compound ‘A’ with molecular formula C5H5O . It does not reduce Tollen’s or Fehling’s reagent but forms a bisulphite compound. It also gives iodoform tests. Identify A OR (a)An organic compound ‘A’ with molecular formula C5H8O2 is reduced to n-pentane on treatment with Zn-Hg/HCI. ‘A’ forms a dioxime with hydroxylamine and gives a positive iodoform test and Tollen’s test. Identify the compound A and deduce its structure. (b) An aromatic compound A on treatment with aqueous ammonia and heating forms compound B which on heating with Br2 and KOH forms a compound C of molecular formula C6H7N .Write the structures and IUPAC names of compounds A,B,C.
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WELL CAN U TEMME HOW SHUD I PREPARE ORGANIC 4 XI EXMZ I THINK ITZ TOO VAST HOW SHUD I PREPARE SO DAT NTHING IS LEFT
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i am from 12th cbse chennai
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Sir , Will the abcd questions of Organic be only from the text ?Back questions ?
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Sir , There are Important equations given behnd the Exams idea guide and together with chemistry. There are equations which are not to be found in the text but tested , What to do sir ?
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Sir you there?? This is Bhagya ,
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dear sir.....plz help in mathematics...
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hi are u a student or a teacher ??????
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