Preview Objective Chemistry for NEET Vol II by A.K. Singhal, U.K. Singhal (2018)

Preview Objective Chemistry for NEET Vol II by A.K. Singhal, U.K. Singhal (2018) Preview Objective Chemistry for NEET Vol II by A.K. Singhal, U.K. Singhal (2018) Preview Objective Chemistry for NEET Vol II by A.K. Singhal, U.K. Singhal (2018) Preview Objective Chemistry for NEET Vol II by A.K. Singhal, U.K. Singhal (2018) Preview Objective Chemistry for NEET Vol II by A.K. Singhal, U.K. Singhal (2018)

2XY is given below: (1) X2 → X + X (fast) (2) X + Y2 XY + Y (slow) (3) X + Y → XY (fast) The overall order of the reaction will be: (a) 2 (b) 0 (c) 1.5 (d) 1 N2 + 3H2 N2 + O2 (a) A : H C—C—CH —  OH — B : H3C—C—CH  SO4 B : H3C—C—CH3 O 2NH3   2NO   K1 K2 H2 + O2 → H2O   intermediate → product (A) O The equilibrium constant of the following are: Predict the correct intermediate and product in the following reaction: H2O, H2SO4 HgSO4 B : H3C—C—CH3  OH  Which one is the correct order of acidity? (a) CH CH > CH3 C CH > CH2 CH2 > CH3 CH3 (b) CH CH > CH2 CH2 > CH3 C CH > CH33 CH3 (c) CH33 CH3 > CH2 CH2 > CH33 C CH> CH CH (d)  CH2 CH2 > CH33 CH CH2 > CH33 C CH > CH CH CH (c) A : H3C—C CH2 SO4 The heating of phenyl-methyl ethers with HI produces: (a) Iodobenzene (b) Phenol (c) Benzene (d) Ethyl chlorides C B : H3C—C CH O (d) A : H3C—C CH2 The element Z = 114 has been discovered recently It will belong to which of the following family/group Perodic Table and electronic configuration? (a) Carbon family, [Rn] 5f14 6d10 7s2 7p2 (b) Oxygen family, [Rn] 5f14 6d10 7s2 7p4 (c) Nitrogen family, [Rn] 5f14 6d10 7s2 7p6 (d) Halogen family, [Rn] 5f14 6d10 7s2 7p5 H3C (b) A : H3C—C—CH3 (B) K3 The equilibrium constant (K) of the reaction: 2NH3 + O 2 K 2NO + 3H2O, will be: (a) K2K33 /K1 (b) K2K3 /K1 (c) K23K3 /K1 (d) K1K33 /K2 Which one is the most acidic compound? (a) OH (b) OH NO2 O2N OH (c) OH (d) ON2 NO2 CH3 The correct increasing order of basic strength for the following compounds is: NH2 NH NH (1) (3) (2) NO2 CH3 xxiv  ■  2017 Solved Question Paper (a) < < (c) < < (b) < < (d) < < 10 Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field? (a) K (b) Rb (c) Li (d) Na 11 The most suitable method of separation of : mixture of ortho and para-nitrophenols is: (a) Chromatography (b) Crystallisation (c) Steam distillation (d) Sublimation 12 HgCl2 and I2 both when dissolved in water containing I– ions the pair of species formed is: (a) HgI2, I– (b) HgI42, I3– – (c) Hg2I2, I (d) HgI2, I3– 13 Mixture of chloroxylenol and terpineol acts as: (a) Antiseptic (b) Antipyretic (c) Antibiotic (d) Analgesic 14 An example of a sigma bonded organometallic compound is: (a) Grignard’s reagent (b) Ferrocene (c) Cobaltocene (d) Ruthenocene 15 A first order reaction has a specific reaction rate of 10–2 sec–1 How much time will it take for 20g of the reactant to reduce to g? (a) 138.6 sec (b) 346.5 sec (c) 693.0 sec (d) 238.6 sec 17 Concentration of the Ag+ ions in a saturated solution of is solubility product of Ag2C2O4 is 2.2 X 104 mol L1 solubility product of Ag2C2O4 is: (a) 2.66 × 1012 (b) 4.5 × 1011 12 (c) 5.3 × 10 (d) 2.42 × 108 18 In the electrochemical cell: Zn | ZnSO4 (0.01M) | | CuSO4 (1.0 M) | Cu, the emf of this Daniel cell is E1 When the concentration of ZnSO4 is changed to 1.0M and that of CuSO4 changed to 0.01M, the emf changes to E2 From the followings, which one is the relationship between E1 and E2? (Given, RT = 0.059) F (a) E1 < E2 (b) E1 > E2 (c) E2 = ≠ E1 (d) E1 = E2 19 Which of the following pairs of compounds is isoelectronic and isostructural? (a) Tel2, XeF2 (b) IBr2-, XeF2 (c) IF3, XeF2 (d) BeCl2, XeF2 20  The IUPAC name of the compound O O H–C is: (a) 5-formylhex-2-en-3-one (b) 5-methyl-4-oxohex-2-en-5-al (c) 3-keto-2-methylhex-5-enal (d) 3-keto-2-methylhex-4-enal 16 Match the interhalogen compounds of column-I with the 21  Which one is the wrong statement? geometry in column-II and assign the correct code (a) The uncertainty principle is ΔE x Δt ≥ h/4π (b)  Half filled and fully filled orbitals have greater Column-I Column-II stability due to greater exchange energy, greater (a) XX' (i) T-shape symmetry and more balanced arrangement (c) The energy of 2s orbital is less than the energy of 2p Pentagonal (b) XX'3 (ii) orbital in case of Hydrogen like atoms bipyramidal h , (d)  De-Broglies’s wavelength is given by λ = where mv (c) XX'5 (iii) Linear m = mass of the particle, v = group velocity of the particle (d) XX'7 (iv) Square-pyramidal 22  Which is the incorrect statement? (v) Tetrahedral (a) Density decreases in case of crystals with Schottky’s defect Codes: (b) NaCl(s) is insulator, silicon is semiconductor, silver (a) (b) (c) (d) is conductor, quartz is piezo electric crystal (1) (iii) (i) (iv) (ii) (c) Frenkel defect is favoured in those ionic compounds (2) (v) (iv) (iii) (ii) in which sizes of cation and anions are almost equal (3) (iv) (iii) (ii) (i) (d) FeO0.98 has non stoichiometric metal deficiency (4) (iii) (iv) (i) (ii) defect 2017 Solved Question Paper   ■  xxv 23  The species, having bond angles of 120° is: (a) CIF3 (b) NC13 (c) BC13 (d) PH3 24  For a given reaction, ΔH = 35.5 kJ mol1 and ΔS = 83.6 Jk1 mol1 The reaction is spontaneous at: (Assume that ΔH and ΔS not vary with tempearature) (a) T > 425 K (b) All temperatures (c) T > 298 K (d) T < 425 K 25  Which of the following is a sink for CO? (a) Micro organism present in the soil (b) Oceans (c) Plants (d) Haemoglobin 26  If molality of the dilute solutions is doubled, the value H of molal depression constant (Kf) will be: (a) Halved (b) Tripled (c) Unchanged (d) Doubled 27  Which of the following is dependent on temperature? (a) Molarity (b) Mole fraction (c) Weight percentage (d) Molality 28  Which one of the following statements is not correct? (a) The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium (b) Enzymes catalyse mainly bio-chemical reactions (c) Coenzymes increase the catalytic activity of enzyme (d) Catalyst does not initiate any reaction 29 Identify A and predict the type of reaction: OCH3 NaNH2 A Br OCH3 NH2 and elimination addition reaction (1) OCH3 Br (2) and cine substitution reaction OCH3 (3) and cine substitution reaction OCH3 (4) and substitution reaction NH2 30  The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexs: CoCl3 6NH3, CoCl3.5NH3, CoCl3.4NH3 respectively is: (a) AgCl, AgCl, AgCl (b) AgCl, AgCl, AgCl (c) AgCl, AgCl, AgCl (d) AgCl, AgCl, AgCl 31  The correct statement regarding electrophile is: (a) Electrophile is a negatively charged species and y can form a bond by accepting a pair of electrons from another electrophile (b) Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile (c)  Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile (d) Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile 32  A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L The change in internal energy ΔU of the gas in joules will be: (a) – 500J (b) – 505J (c) + 505J (d) 1136.25J 33  Which of the following reactions is appropriate for converting acetamide to methanamine? (a) Hoffmamn hypobromamide reaction (b) Stephens reaction (c) Gabriels phthalimide synthesis (d) Carbylamine reaction 34  With respect to the conformers of ethane, which of the following statements is true? (a) Bond angle changes but bond length remains same (b) Both bond angle and bond length change (c) Both bond angles and bond length remains same (d) Bond angle remains same but bond length changes 35  In which pair of ions both the species contain S-S bond? (a) S4O62, S2O32 (b) S4O72, S2O82 (c) S4O62, S2O72 (d) S2O72, S2O32 xxvi  ■  2017 Solved Question Paper 36  It is because of inability of ns2 electrons of the valence shell to participate in bonding that: (a) Sn2+ is oxidising while Pb4+ is reducing (b) Sn2+ and Pb2+ are both oxidising and reducing (c) Sn4+ is reducing while Pb4+ is oxidising (d) Sn2+ is reducing while Pb4+ is oxidising (In English-4, In Hindi-1) 37  Correct increasing order for the wavelengths of absorption in the visible region the complexes of Co3+ is: (a) [Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+ (b) [Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+ (c) [Co(NH3)6]3+ , [Co(en)3]3+, [Co(H2O)6]3+ (d) [Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+ 38  Consider the reactions: Cu X 573K (C2H6O) Z A [Ag(NH3)2]+ Silver mirror – OH∆ observed – OH∆ Y O NH2–NH–C–NH2 Identify A, X, Y and Z (a)  A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide (b) A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazide (c) A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone (d) A-Methoxymethane, X-Ethanoic Acid, Y-Acetate ion, Z-Hydrazine 39  Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating? (1) (2) OH O O (3) (4) O O OH 40  Which Of the Following pairs of species have the same bond order? (a) O2, NO+ (b) CN , CO (c) N2, O2 (d) CO, NO 41  Extraction of gold and silver involes leaching with CNion Silver is later recovered by: (a) distillation (b) zone refining (c) displacement with Zn (d) liquation 42  A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO) The volume of the container is now decreased by moving the movable piston fitted in the container The maximum volume of the container, when pressure of CO2 attains its maximum value, will be: (Given that: SrCO3(s) SrO (s) + CO2 (g), Kp = 1.6 atm) (a) 10 litre (b) litre (c) litre (d) litre 43  Pick out the correct statement with respect to [Mn (CN)6]3: (a) It is sp3d2 hybridised and tetrahedral (b) It is d2sp3 hybridised and octahedral (c) It is dsp2 hybridised and square planar (d) It is sp3d2 hybridised and octahedral 44  The reason for greater range of oxidation states in actinoids is attributed to: (a) Actinoid contraction (b) 5f, 6d and 7s levels having comparable energies (c) 4f and 5d levels being close in energies (d) The radioactive nature of actinoids 45  Which of the following statements is not correct: (a) Ovalbumin is a simple food reserve in egg-white (b) Blood proteins thrombin and fibrinogen are involved in blood clotting (c) Denaturation makes the proteins more active (d) Insulin maintains sugar level in the blood of a human body Answer Keys 11 21 31 41 (a) (c) (c) (c) (c) 12 22 32 42 (c) (b) (c) (b) (d) 13 23 33 43 (a) (a) (c) (a) (b) 14 24 34 44 (b) (a) (a) (c) (b) 15 25 35 45 (a) (a) (a) (a) (c) 16 26 36 (c) (a) (a) 17 (c) (c) 27 (a) (d, a) 37 (d) 18 28 38 (c) (b) (a) (b) 19 29 39 (c) (b) (d) (a) 10 20 30 40 (c) (d) (b) (b) 2017 Solved Question Paper   ■  xxvii Hints and Explanations  SO2 being a reducing agent which can reduce and decolourise KMNO4 into MN2+ as follows: 2KMNO4 + 5SO2 + 2H2O K2SO4 + 2MnSO4 + 2H2SO4 Colourless HI SN2 CH3I + C6H5OH CH > CH3 → C CH > CH2 CH2 > CH3CH3 Sp Sp Sp2 Sp3 S → 50% 50% 33% 28%  N2 + 3H2 N2 + O2 H 2O Hg 2+ /H + (I) Size of Hydrated Ion 10  Ionic mobility ∝ Li +− nH O < Na + nH O < K1+ nH O < Rb.+ nH O Ionic mobility ↑ as Size of Ion ↓ HC H 3C − C ≡ CH NO2 ‒ I, ‒ R (II) CH +I, +R (III) CH − C| = CH Tautomerisation I2 12  HgCl2  Acidic nature ∝ S% ∝ +I  > 11  Steam distillation is used to separete a mixture of ortho and para nitro phenols 4  If is a2 SN2 reaction CH3OC6H5 > > = 1.5  Z = 114 Electronic configuration of Z = [Rn] 5f146d10 7s27p2 Period = 7th or VIIth Block = lp Gp.No = + = IVth (carbon family) 2  Ordered Reactions is given by slowest step of the reaction X + Y2 XY + Y Order =  Basic Nature of Amines ∝ +I+R ∝ -I ∝ -R NH NH NH O HgI2 – I –Cl2 I– + I2 I– HgI4–2 I3– 13  Mixture of Chloroxylenol and terpineol acts as Antiseptic There are components of Dettol 14  Grighard Feagent [R-mgx] is a Sigma bonded Organometallic Compound here || CH − C − CH (B) OH 2NH3 K1 } Reverse It 2NO K2 15  K= t= N 2.303  log10   t NT 2.303  20  × log10   −2 10   H2 + O2 → H2O K3 } × 2NH3 + O2 16 On solving t = 138.6 sec 2NO + 3H2O Kc XX' SP K K3 KC = K1 Linear OH > > NO2 XX'3 XX'5 3 OH > CH3 XX'7 SP d SP d SP3 d3 T- Shape Square Pyramidal Pentagenal bipyramidel 2Ag+ + Cro4 2Ksp= (Ag+)2 [Cro42-] 17  Ag2 Cro4  Acidic Nature ∝ - I ∝ +I OH So ON2 OH NO2 NO2 2.2 = (2.2 × 10-4) ( × 10-4) = 5.32 × 10-12 xxviii  ■  2017 Solved Question Paper (0.01) 0.059 log10 (1)2 – (1) 0.059 log10 (0.01)2 – 18  E1 = Eo E2 = Eo Hence E1 > E2 27  Molarity ∝ (2) Molality, Molefraction, Weight percentage don’t depand upon tempertature (3) 19  Both XeF2 and IBr–2 are Linear in shape: 28  As Catalyst does not change the value of Keq 29  OCH OCH3 KNH F ° ° Xe Br ° ° ° ° ° ° F Sp3d I Br O H–C 3-keto 2-methyl he x 4-en 1-al or 4-enal 3AgNo3 30  [Co(NH3)6]Cl3 → [Cο(ΝΗ3)6 ]3+ + 3AgCl 2AgNo [Cο(ΝΗ3)5 Cl]2+ + 2AgCl [Co(NH3)5Cl]Cl2 → NH It is a case of Nucleophillic substitution by using Benzyne as reaction intermediate –KBr Br ° ° ° ° Sp3d 20  Temperature (1) AgNo [Cο(ΝΗ3)4 ]Cl]+ + 2AgCl [Co(NH3)4Cl2]Cl → 56 Hence, 3, 2, AgCl are formed 21  In case of Hydrogenic species is: 1s < 2s = 2p < 3s = 3b = 3d Hence 2s and 2p have same energy for Hydrogenic species 22  As Frankel defect is observed in Ionic Compounds with low co-ordination number and in which size of cation and anion differ largely 23  As BCl3 is co-planar (Tow Angular) so have 120° Cl 31  Eletrophile is an e‒ deficient species which may be positively charged or neutral It accepts e‒ from e‒ rich (Nucleophile) 32  As q = so using Ist law of Thermodynamics ΔV = −p ΔV = −2.5(4.5 − 2.5) = −5 lit atm = −5 × 101.3 = − 506.5 Joule = −505 J 33  O || CH3 − C− NH + Br2 + 4KOH → CH3 NH2 + 2KBr + K2 CO3 + 2H2 O B 120˚ Cl Cl 24  As Both ΔH and ΔS are positive so to keep ΔG = –ve High Temp is favourable so that process become spontaneous ΔG = ΔH ‒T ΔS T> ΔH ΔS 35.5 × 1000 = > 424.6 K 03.6 T > 425K 25  Microorganisms present in soil acts like a link for Co 26  KF ∝ molarity Hence it remains unchanged or constant It is called Hoffmann hypbromamide reaction 34  In Ethane, in both forms staggared, and eclipsed Bond length and Bond angles remain same 35  S4O62–, S2 O32– both contain S-S bonds S O _ _ O S O O S O_ _ (S2O32 ) O O S O _ _ O (S4O62 36 Due to Inert pair effect Sn2+ → Reductant Pb4+ → Oxidant ) 2017 Solved Question Paper   ■  xxix — 40 As CN and CO both have 14e‒ so using M.O.T the bond order is and same for both ]3+, [Co(NH3)6]3+, [Co(H2O)6]3+ 37 [Co(CN)3 d (↑) as strongness of ligand decreases 38 C H O Cu ∆ 573 K C2H5OH CH3CHO (A) Ethanal (Ag (NH3)2)+ ∆ OH ‒ Aidol ∆ H2N‒NH CONH2 Silver mirror (Ag↓) CH3‒C‒H = CH‒CHO (Y) But‒2‒en1‒al CH3‒CH=N NH CO NH2 Acetal dehyde Semicarbazone (Z) 39 O O 42 As here maximum press of CO2 = Kp = 1.6 atm P1V1 = P2V2 P1V1 0.4 × 20 V2 = P = = litre 1.6 — 43 As in [Mn(CN)6]3– Co·No is and CN being strong – ligand paired up 3d e so it is d sp and Octahedral Complex OH Aldol cond –H2O H H 41 ‘Zn’ being more reactive easily displaces Ag from [Ag (CN)2]– O (Aldol) 44 Actioids show more oxidation states ( + 2, + 3, + 4, + 6, etc.) as 5f, 6d, 7s have comparable energies 45 As during Denaturation of protein, the reactivity of protein decreases ... crystal (1) (iii) (i) (iv) (ii) (c) Frenkel defect is favoured in those ionic compounds (2) (v) (iv) (iii) (ii) in which sizes of cation and anions are almost equal (3) (iv) (iii) (ii) (i) (d) FeO0.98... energy of 2p Pentagonal (b) XX'3 (ii) orbital in case of Hydrogen like atoms bipyramidal h , (d)  De-Broglies’s wavelength is given by λ = where mv (c) XX'5 (iii) Linear m = mass of the particle,... metal deficiency (4) (iii) (iv) (i) (ii) defect 2017 Solved Question Paper   ■  xxv 23  The species, having bond angles of 120° is: (a) CIF3 (b) NC13 (c) BC13 (d) PH3 24  For a given reaction,