CHEMISTRY MARKING SCHEME Guwahati SET -56/2/G. 4 Dispersed phase: Solid, Dispersion medium: Gas ½ + ½. 5 2,4 dimethylphenol 1

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1 Sr. No. CHEMISTRY MARKING SCHEME Guwahati -205 SET -56/2/G Value points Marks Zn : [Ar] 3d 0 4s 2 / Because of Fully filled d-orbitals in ground state as well as in the oxidized state. 2 F/ Faraday 3 CH 3 C 6 H 5 CH Br 4 Dispersed phase: Solid, Dispersion medium: Gas 5 2,4 dimethylphenol 6 T f = T f 0 - T f The decrease in freezing point of a solvent due to the dissolution of a non-volatile solute in it is called depression in freezing point T f = K f m T f =K f x W 2 / M 2 W /000 M 2 = K f.w 2 x 000 W. T f 7 Order Molecularity Sum of powers to which the concentration terms are raised in rate law expression. May also be zero or in fraction The number of reacting species in an elementary reaction. Cannot be zero or fraction. ( or any other correct differences) + 8 i) C 6 H 5 NH 2 < CH 3 CH 2 NH 2 < CH 3 NHCH 3 ii) (CH 3 ) 3 N < CH 3 NHCH 3 < C H 3 NH 2 +

fsfsfsdfsfs rtr 9 + 0 i) ii) Dichloridobis(ethane,2-diamine)cobalt (III) ion Geometrical Isomerism / cis-trans Isomerism/ optical isomerism + 0 i) [Ni (CO) 4 ] ii) K 2 [Fe(CN) 4 ] (i) CH 3 CH 2 - CH

2 fsfsfsdfsfs rtr i) ii) Dichloridobis(ethane,2-diamine)cobalt (III) ion Geometrical Isomerism / cis-trans Isomerism/ optical isomerism + 0 i) [Ni (CO) 4 ] ii) K 2 [Fe(CN) 4 ] (i) CH 3 CH 2 - CH 2 OH (ii) CH 3 -CH 2 -CH(OH)-CH (iii) (i) ++ (ii) (iii) (Or any other correct method.) 3 (i) Aniline being a base reacts with AlCl 3 (Lewis Acid) to form a salt. (ii) CH 3 group shows +I effect(electron releasing group) whereas NO 2 group shows I- effect(electron withdrawing group) (iii)to reduce activating effect of NH 2. ++

3 4 = = = P = 0.0X = P P = mmhg 5 (i) Crystalline solids They have definite and regular geometry which extends throughout the crystal.i.e, they have long range order. (ii) Frenkel defect caused by the dislocation of cation in the crystal lattice. (iii) n type semiconductor These are obtained due to metal excess defect or by adding trace amounts of group 5 elements ( P, As ) to extremely pure silicon or germanium by doping. 6 k= log [ A 0 ] t [A] ++ k = log 00 0min 75 k = x min k = min - t /2 =0.693 = k min - t /2 = 24.07min 7 i) When both absorption and adsorption take place together, the phenomenon is referred to as Sorption. ii)the colloidal dispersion/solution in which the dispersed phase has got an affinity for the dispersion medium / solvent loving. iii)colloids in which small sized dispersed phase particles aggregate to form particles of sizes within the colloidal range (micelles) at a definite concentration of the solution(above CMC)/substance which act as strong electrolyte at low concentrations but act as colloids at higher concentration due to micelle formation. ++

4 8 a)impure Zr reacts with I 2 to form volatile ZrI 4 which when heated at higher 9 temperature decomposes to give pure Zr. b)co acts as a reducing agent. c) It is a mixture of Cu 2 S and FeS. ( i) Styrene, C 6 H 5 CH=CH 2 (ii) Adipic Acid HOOC CH 2 CH 2 CH 2 CH 2 COOH Hexamethylenediamine H 2 N (CH 2 ) 6 NH 2 (iii ) Ethylene glycol HO-CH 2 -CH 2 -OH ++ /2 + /2 9 Terephthalic acid (note: half mark for name/s and half mark for structure/s). Linear polymers Monomeric units join to form long polymeric chains. 2. Branched chain polymers - Monomeric units join not only to form long polymeric chains but also branches. /2 + / Three dimensional network polymers or cross-linked polymers- Monomeric units join to form long polymeric chains and cross links. ++ (i) (ii) Intermolecular H-Bonding. (iii) Pernicious Anaemia. 2 i) Due to intermolecular H-bonding in ammonia. ii) Bond dissociation enthalpy of H Te bond is lesser than that of H S bond. iii)cl 2 + H 2 O HOCl + HCl or Due to the formation of Hydrochloric acid and Hypochlorus acid. 22 (a) (i) sp 3 d 2, Octahedral (ii) sp 3, Tetrahedral (b) CO, because of synergic or back bonding. 23 (i) Concern for students health, Application of knowledge of chemistry to daily life, empathy, caring or any other (ii) Through posters, nukkad natak in community, social media, play in assembly or any other (iii) Tranquilizers are drugs used for treatment of stress or mild and severe mental disorders. Eg: equanil (or any other suitable example) (iv) Aspartame is unstable at cooking temperature. ++,,,

5 A0a 24 x 4=2 (a) A- CH 3 COCl B- CH 3 CHO C- D- CH 3 CH 2 OH b) i)on heating with NaOH/ I 2, CH 3 COCH 2 CH 3 gives yellow ppt of CHI 3 whereas CH 3 CH 2 CH 2 CHO does not. ii)on adding NaHCO 3 solution, ethanoic acid gives brisk effervescence whereas ethanal does not. (Or any other distinguishing test) c) CH 3 COCH 2 CH(Cl)CH 3 24 (a) (i) CH 3 -CH 2 -CH 3 (ii) CH 3 -CH 2 -CH=N-OH 25 (b) HCHO CH 3 CHO CH 3 COCH 3 (c) On heating with NaOH/ I 2, C 6 H 5 COCH 3 gives yellow ppt of CHI 3 whereas C 6 H 5 CHO does not. E Cell =(E O c-e O A) 0.059/2 V log [Mg 2+ ] /[Ag + ] 2 = [.80-(-2.37)]-0.059/2 V log [0-2 /(0-4 ) 2 ] = V X log 0 6 = V X 6 = = V ΔG = -nfe Cell = -2 X Cmol - X V = Jmol - = kjmol - (or any other distinguishing test) 25 Λ m =(k/m) x 000 Scm 2 mol - = (4.95 x 0-5 /0.00) x 000 Scm 2 mol - = 49.5 Scm 2 mol - α= Λ M /Λ 0 M Λ 0 M= λ 0 CH3COO-+ λ 0 H+ = ( ) Scm 2 mol -

6 26 26 = 390.5Scm 2 mol - α = 49.5/390.5 = 0.27 or 2.7% b)which converts energy of combustion of fuels directly into electrical energy. Advantages: high efficiency,pollution free (i) +3 oxidation state of Eu is more stable. (ii) Due to d-d transition / unpaired electrons in d orbitals. (iii) Due to completely filled d-orbitals which leads to weak metallic bond. (b) (i) 2KMnO 4 K 2 MnO 4 +O 2 +MnO 2 (ii) Cr 2 O H Fe 2+ 2 Cr Fe H 2 O (a) (i)because small size atoms like B, C, H,N occupy interstitial sites in the lattice of transition elements. (ii) Because Cr 3+ has the stable t 2g 3 configuration whereas Mn 2+ has stable 3d 5 configuration(half filled). (iii) Due to involvement of d-electrons in metallic bonding. (b) Misch metal is an alloy which consist of a lanthanoid metal(95%) and iron (5%) and traces of S,C,Ca and Al. USE- It is used in Mg-based alloy to produce bullets, shell and lighter flint.

CHEMISTRY MARKING SCHEME Bhubaneswar 2015 Set 1 - Code No. 56/1/B. Ques. Value points Marks. 1. Negative charge 1

CHEMISTRY MARKING SCHEME Bhubaneswar 205 Set - Code No. 56//B Ques. Value points Marks. Negative charge 2. XY 3 3. HOCl, HOClO, HOClO 2, HOClO 3 + (Any two) 4. -Phenylpropan-2-ol 5. CH 3 CH CH 2 CH 2 Br