Snakes and Ladders in Chemistry (Eamcet Special)

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Snakes and Ladders in Chemistry (Eamcet Special)
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  Snakes and ladders in chemistry (eamcet special)    Order of energies: gamma rays > X rays > UV  –  rays visible> I.R> micro wavws > T.V waves > T.V waves > radio waves Note: energy frequency  /wave length   wave number    Order of energies of list line in H- spectrum :Lyman>balmer>paschen>brackett>pfund. :in a given series,1 st  line has least energy or longest wave length and last line has highest energy or least wave length    In an atom as the n (orbit no.) value increases 1.   K.E ↓  2.   P.E ↑  3.   Total energy ↑  4.   Velocity 5.   Energy difference between adjacent orbits decreases ( ↓)  6.   Distance between adjacent orbits increase  –  es( ↑)      Distance between two successive orbits = 0.529 (m+n)A°.,m and n are orbit numbers in increasing order    If the velocities of electron (e), proton (P) neutron (n), o 2 , H 2 molecules are same, then the order of  their deBrogile’s wave length is                         Order of filling up of sublevels in 6 th  period: 6s, 4f, 5d, 6p    Order of sizes:A -  > A > A + . i.e, anion > >neutral atom>cation      Order of radii:N -3 >O -2 >F>Na + Mg +2 >A1 +3    Order of different radii:vander waals> crys  –  tal>covalent    Order of ionisation potentials of 3 rd  period elements: Na< Mg>A1>Si<P>S<C1<Ar. Note: 1.   I.P of Si>I.P of Mg 2.   In e given period a) II A group element(ns²) has greater I.P then IIIA group element b)VA group element (ns²np³) has greater I.P then corresponding VI A group element    Order of I.P: He>Ne>F>Ar>N>O>H; Order of I.P:Al +3 >Mg +2 >Na +  Note: in ISO electronic ions, the ion with grater atomic number is 1. Smaller in size 2. Having greater I.P    Order of 2ndionisation potentials is carbon , nitrozen, oxygen and flourine is: O>F>N>C. Note: for 2 nd  IP, consider preceding element.     Order of electron affinity: Cl>F>Br>I>S;    Elements with maximum electron affinity: chlorine    Order of E>A:IV Agroup elements > VA group elements (i.e carbon > nitrogen)    Order of E.A(VI A) s>Se>Te>O(EA 2 :O>S>Se>Te)    IIA group elements and Nitrogen have positive E.A    Order of E.N: Fluorine (4) > oxygen(3.%)> Nitrogen (3.0) = Chlorine (3.0); (H - 2.1, C  –  2.5, P = 2.1; C= S = 1 = 2.5)    Elements with maximum electronegativity is fluorine and lowest is Cs.        = 2.8x    (X= electro negativity)     rder of E>N in IVA:C> Si = Ge = sn= Pb;    Order of E.Nin IIIA:B >Tl>In>Ga>Al    Order of ease of formation and stability of cations:Na + >Mg +2 >Al +3    Anions:F>O -2 >N -3  Note: smaller is charge on ion, greater is stability.    Order of size of orbitals:sp 3 >sp 2 >sp.    Order of ionic character: CsCI> RbCI> KCL>NaCl> LiCl    Order of C-C bond length Ethane = diamond > graphite> benzerne> C 2 H 4 > C 2 H 4    (sp 3 -s) (sp 2 - s) (sp-s)    Order of O-Obond length H 2 O 2 >O 3 >o 2      Order of C-O bond length:  3−2 >Co 2 >CO    Order of bond energy ( single) C- C > -N-N->F-F>-O-O    O-H bond length is 0.978Awhere as O---- H (H-bond) bond length is 1.76A    Order of strengths of Hydrozen bond: F…..H - F>F….H - F>O……H - O>N…..H -N    Order of stength of the bond:              Order of B.Pts among the Hydrides of 1.   IVA group: Sn  4 >Ge  4    4    4 (No Hydrozen bond) 2.   VA group:Sb  3 >N  3    3    3  3.   VIA: H 2 O> H 2 Te> H 2e  H 2s  4.   VIIA group:HF>HI>HBr>HCl    Order of ratesof diffusion: H 2 >H e >CH 4 .    Order of molecular velocities:   >   ̅ >Cp    Order of number of molecules processing different velocities: CP >   ̅ >          :  ̅:   = 1:1.128 : 1.224 or 0.816 :0.921:1      of D 2 O is graeter then 7 (at 250°C) but it is neutral because    of D 2 o is > 14 at 25°C    Order of radii of alkali metal ions in H 2 o:
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