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  • GATE Syllabus for CY-Chemistry

    PHYSICAL CHEMISTRY

    Structure: Quantum theory: principles and techniques; applications to a particle in a box, harmonic oscillator, rigid rotor and hydrogen atom; valence bond and molecular orbital theories, Huckel approximation; approximate techniques: variation and perturbation; symmetry, point groups; rotational, vibrational, electronic, NMR, and ESR spectroscopy

    Equilibrium: Kinetic theory of gases; First law of thermodynamics, heat, energy, and work; second law of thermodynamics and entropy; third law and absolute entropy; free energy; partial molar quantities; ideal and non-ideal solutions; phase transformation: phase rule and phase diagrams ? one, two, and three component systems; activity, activity coefficient, fugacity, and fugacity coefficient; chemical equilibrium, response of chemical equilibrium to temperature and pressure; colligative properties; Debye-Huckel theory; thermodynamics of electrochemical cells; standard electrode potentials: applications ? corrosion and energy conversion; molecular partition function (translational, rotational, vibrational, and electronic).

    Kinetics: Rates of chemical reactions, temperature dependence of chemical reactions; elementary, consecutive, and parallel reactions; steady state approximation; theories of reaction rates ? collision and transition state theory, relaxation kinetics, kinetics of photochemical reactions and free radical polymerization, homogeneous catalysis, adsorption isotherms and heterogeneous catalysis.

    INORGANIC CHEMISTRY

    Main group elements: General characteristics, allotropes, structure and reactions of simple and industrially important compounds: boranes, carboranes, silicones, silicates, boron nitride, borazines and phosphazenes. Hydrides, oxides and oxoacids of pnictogens (N, P), chalcogens (S, Se & Te) and halogens, xenon compounds, pseudo halogens and interhalogen compounds. Shapes of molecules and hard- soft acid base concept. Structure and Bonding (VBT) of B, Al, Si, N, P, S, Cl compounds. Allotropes of carbon: graphite, diamond, C60. Synthesis and reactivity of inorganic polymers of Si and P.

    Transition Elements: General characteristics of d and f block elements; coordination chemistry: structure and isomerism, stability, theories of metal- ligand bonding (CFT and LFT), mechanisms of substitution and electron transfer reactions of coordination complexes. Electronic spectra and magnetic properties of transition metal complexes, lanthanides and actinides. Metal carbonyls, metal- metal bonds and metal atom clusters, metallocenes; transition metal complexes with bonds to hydrogen, alkyls, alkenes and arenes; metal carbenes; use of organometallic compounds as catalysts in organic synthesis. Bioinorganic chemistry of Na, K. Mg, Ca, Fe, Co, Zn, Cu and Mo.

    Solids: Crystal systems and lattices, miller planes, crystal packing, crystal defects; Bragg?fs Law, ionic crystals, band theory, metals and semiconductors, Different structures of AX, AX2, ABX3 compounds, spinels.

    Instrumental methods of analysis: Atomic absorption and emission spectroscopy including ICP-AES, UV- visible spectrophotometry, NMR, mass, Mossbauer spectroscopy (Fe and Sn), ESR spectroscopy, chromatography including GC and HPLC and electro-analytical methods (Coulometry, cyclic voltammetry, polarography . amperometry, and ion selective electrodes).

    ORGANIC CHEMISTRY

    Stereochemistry: Chirality of organic molecules with or without chiral centres. Specification of configuration in compounds having one or more stereogenic centres. Enantiotopic and diastereotopic atoms, groups and faces. Stereoselective and stereospecific synthesis. Conformational analysis of acyclic and cyclic compounds. Geometrical isomerism. Configurational and conformational effects on reactivity and selectivity/specificity.

    Reaction mechanism: Methods of determining reaction mechanisms. Nucleophilic and electrophilic substitutions and additions to multiple bonds. Elimination reactions. Reactive intermediates- carbocations, carbanions, carbenes, nitrenes, arynes, free radicals. Molecular rearrangements involving electron deficient atoms.

    Organic synthesis: Synthesis, reactions, mechanisms and selectivity involving the followingalkenes, alkynes, arenes, alcohols, phenols, aldehydes, ketones, carboxylic acids and their derivatives, halides, nitro compounds and amines. Use of compounds of Mg, Li, Cu, B and Si in organic synthesis. Concepts in multistep synthesis- retrosynthetic analysis, disconnections, synthons, synthetic equivalents, reactivity umpolung, selectivity, protection and deprotection of functional groups.

    Pericyclic reactions: Electrocyclic, cycloaddition and sigmatropic reactions. Orbital correlation, FMO and PMO treatments.

    Photochemistry: Basic principles. Photochemistry of alkenes, carbonyl compounds, and arenes. Photooxidation and photoreduction. Di-??- methane rearrangement, Barton reaction.

    Heterocyclic compounds: Structure, preparation, properties and reactions of furan, pyrrole, thiophene, pyridine, indole and their derivatives.

    Biomolecules: Structure, properties and reactions of mono- and di-saccharides, physicochemical properties of amino acids, chemical synthesis of peptides, structural features of proteins, nucleic acids, steroids, terpenoids, carotenoids, and alkaloids.

    Spectroscopy: Principles and applications of UV-visible, IR, NMR and Mass spectrometry in the determination of structures of organic molecules.

  • US Immigration – Visa Changes

    Visa changes

    Making changes to or extending the I-20 form

    If the student is not able to complete his studies by the expiration date on the I-20 form, he must apply to the school’s foreign student advisor for an extension at least 30 days before the expiration date. Usually extensions will granted if the student provides academic or medical reasons.

    If the student changes degree programs (such as from a bachelor?s degree to a master?s degree program), the student will need to get a new I-20 form and submit it to the foreign student advisor within 15 days of beginning the new program. No changes need to be made to the I-20 form simply a change of major.

    In order to transfer to another school, the student will need to notify the current school of the transfer and obtain an I-20 form from the new school. The student must provide the foreign student advisor at the new school with the completed I-20 form within 15 days of beginning classes at the new school.

    Length of stay

    The length of time that a student carrying an F-1 visa is authorized to remain in the US is determined by the INS, not the consular officer. At the port of entry, an INS official will validate the student?s Form I-94, Record of Arrival-Departure, which states the length of stay.

    Typically the student will be admitted into the US for the duration of his coursework. In other words, the student may stay in the US for as long as he is a full-time student, even if the F-1 visa expires.

    However, if the student departs the US with an expired F-1 visa, he will need to obtain a new one before returning to the US to resume his studies. An F-1 visa cannot be renewed or re-issued by the State Department inside the United States; it must be done at an embassy or consulate abroad.

    Renewing a student visa

    All applicants applying for renewals must provide the following items.

    ? A passport valid for at least six months.

    ? A completed and signed application form (DS-156) with a photo for each person applying. A separate form is needed for children, even if they are included in a parent?s passport. These forms are available at the consular office at no charge.

    ? Payment for the processing fee for each applicant.

    ? A new I-20 or an I-20 that has been endorsed on the back by a school official within the past 12 months.

    All applicants applying for renewals should also be prepared to submit:

    ? A certified copy of his grades from the school in which he is enrolled.

    ? Financial documents (from him or his sponsor) showing the ability to cover the cost of schooling.

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