Chemistry K CET 2018 (Version F)

Size: px

Start display at page:

Download "Chemistry K CET 2018 (Version F)"

Shon Bailey
5 years ago
Views:

1 Chemistry K CET 018 (Version F) 1. Which of the following is more basic than aniline? (A) Diphenylamine (B) Triphenylamine (C) p-nitroaniline (D) Benzylamine The lone pair of electrons are not involved in conjugation and is readily available for donation.. The two forms of D-Glucopyranose are called (A) Diastereomers (B) Anomers (C) Epimers (D) Enantiomers Anomeric carbon differs only in the configuration of the hydroxyl group at C1.. Among the following, the branched chain polymer is (A) Polyvinyl chloride (C) Low density polythene (B) Bakelite (D) igh density polythene Low density polythene is obtained through free radical addition and hydrogen atom abstraction and hence has a highly branched structure. 4. Edge length of a cube is 00 pm. Its body diagonal would be (A) 600 pm (B) 4 pm (C) pm (D) pm Body diagonal edge length = = pm 5. Which of the following is not a conductor of electricity? (A) Solid NaCl (B) Cu (C) Fused NaCl (D) Brine solution Electrolytes conduct electricity only in aqueous or molten state but not in solid state. 6. For a cell reaction involving two electron changes, o Ecell 0. V at 5 C. The cell equilibrium constant of the reaction is (A) (B) 10 (C) 10 (D) ne log Kc log Kc log K c = K c = antilog K c =

2 7. The value of rate constant of a pseudo first order reaction (A) Depends only on temperature (B) Depends on the concentration of reactants present in small amounts (C) Depends on the concentration of reactants present in excess (D) Is independent of the concentration of reactants Rate constant is dependent on temperature and nature of the reactants and independent of concentration of reactants. 8. ( ) SiCl is used during polymerization of organosilicons because (A) The chain length of organosilicon polymers can be controlled by adding ( ) SiCl (B) ( ) SiCl improves the quality and yield of the polymer (C) ( ) SiCl does not block the end terminal of silicone polymer (D) ( ) SiCl acts as a catalyst during polymerization The chain length of the polymer can be controlled by adding ( ) SiCl which blocks the ends. 9. When Pb reacts with concentrated N, the gas evolved is (A) N (B) (C) N (D) N Ans The reaction between Pb and N is unlikely (as mentioned in NCERT) however, Pb reacts with N. 10. KMn 4 acts as an oxidising agent in alkaline medium. When alkaline KMn 4 is treated with KI, iodide ion is oxidized to (A) I (B) I (C) I (D) I 4 Mn I Mn I [Fe(N ) Cl ] and [Fe( N) Cl ] shows (A) Linkage isomerism (B) Geometrical isomerism (C) ptical isomerism (D) ydrate isomerism [Fe(N ) Cl ] and [Fe( N) Cl ] contain an ambidentate ligand. ence, the compound exhibits linkage isomerism. 1. Tertiary alkyl halide is practically to substitution by S N mechanism because of (A) Insolubility (B) Instability (C) Inductive effect (D) Steric hindrance Chemistry K CET - 018

3 1. The products X and Z in the following reaction sequence are (A) Isopropylbenzene and acetone (B) Cumene peroxide and acetone (C) Isopropylbenzene and isopropyl alcohol (D) Phenol and acetone C X C + C Y Z 14. The appropriate reagent for the following transformation is (A) Zn - g/cl (B) N N, K/ethylene glycol (C) Ni/ (D) NaB 4 (i) N N (ii) K /ethylene glycol

4 15. In the following reaction the compound Z is (A) Benzoic acid (B) Benzaldehyde (C) Acetophenone (D) Benzene C (i) Cr Cl /CS (ii) The reaction of Benzenediazonium chloride with aniline yields yellow dye. The name of the yellow dye is (A) p-ydroxyazobenzene (B) p-aminoazobenzene (C) p-nitroazobenzene (D) o-nitroazobenzene N Cl + N + N N p-aminoazobenzene N 17. The glycosidic linkage involved in linking the glucose units in amylose part of starch is (A) C 1 C 4 linkage (B) C 1 C 6 -linkage (C) C 1 C 6 -linkage (D) C 1 C 4 -linkage 6 C 5 6 C C 1 C 4 - glycosidic linkage Ziegler-Natta catalyst is used to prepare (A) Low-density polythene (C) igh density polythene n C 4K 67 atm C ZeiglerNatta catalyst [ C C ] n igh density polythene g of Mg is burnt with 0.8 g of in a closed vessel. Which reactant is left in excess and how much? (A) Mg, 5.8 g (B) Teflon (D) Nylon-6 (B) Mg, 0.58 g (C), 0.4 g (D),.4 g Chemistry K CET

5 Mg Mg 48 g of Mg requires g of? requires 0.8 g of Mass of magnesium required 0.4 g But 1 g of Mg is available. Thus, Mg is the excess reagent. Excess of Mg left behind = = 0.58 g 0. The orbital nearest to the nucleus is (A) 4f (B) 5d (C) 4s (D) 7p 1. Which of the following is the correct order of radius? (A) > > + (B) Na + > F > (C) F Na (D) Al Mg N. The intramolecular hydrogen bond is present in (A) Phenol (B) o-nitrophenol (C) p-nitrophenol (D) p-cresol o-nitrophenol. The state of hybrid orbitals of carbon in C,C 4 and C respectively is (A) sp,sp and sp sp C (B) sp C sp,sp and sp 4. For an ideal gas, compressibility factor is sp C (C) sp,sp and sp (D) (A) 0 (B) 1 (C) 1 (D) + pv Z RT For 1 mol of an ideal gas, pv = RT Z = 1 sp,sp and sp n 5. The relationship between K p and K c is K K (RT). What would be the value of n for the reaction N Cl(s) N (g) Cl(g)? 4 p (A) 1 (B) 0.5 (C) 1.5 (D) n = number of moles of gaseous products number of moles of gaseous reactants = 0 = c 5

6 6. Acidity of BF can be explained on which of the following concepts? (A) Arrhenius concept (B) Bronsted-Lowry concept (C) Lewis concept (D) Bronsted-Lowry as well as Lewis concept B in BF is electron deficient and hence, it has a tendency to accept a pair of electrons. 7. For the redox reaction xmn y C z mmn nc p 4 4 The values of x, y, m and n are (A) 10,, 5, 5,, (B), 5,, 10 (C) 6, 4,, 5 (D), 5,, 10 Mn 5C 16 Mn 10C is (A) An oxidising agent (B) A reducing agent (C) Both oxidising and reducing agent (D) Neither oxidising nor reducing agent xygen in hydrogen peroxide is in 1 oxidation state. It can undergo both reduction and oxidation. 9. Dead burnt plaster is 1 (A) CaS 4 (B) CaS 4. Anhydrous CaS 4 is known as dead burnt plaster. (C) CaS 4. (D) CaS Identify the following compound which exhibits geometrical isomerism: (A) But--ene (B) But-1-ene (C) Butane (D) Isobutane C C C cis C C C trans 1. During the fusion of organic compound with sodium metal, nitrogen present in the organic compound is converted into (A) NaN (B) NaN (C) NaCN (D) NaNC C N Na NaCN rganic compound. The reagent X used for the following reaction is R C CR' + X R C C R' (A) Ni (B) Pd/C (C) LiAl 4 (D) Na/Liquid N R C C R Chemistry K CET

7 Syn addition Pd/C Lindlar s catalyst R R' C C. Which of the following ions will cause hardness in water? (A) Ca + (B) Na + (C) Cl (D) K + ardness of water is due to chlorides of Ca +, Mg + ions. 4. Which of the following oxides shows electrical properties like metals? (A) Si (B) Mg (C) S (s) (D) Cr Cr 5. Which of the following aqueous solutions should have the highest boiling point? (A) 1.0 M Na (B) 1.0 M Na S 4 (C) 1.0 M N 4 N (D) 1.0 M KN T b number of particles of solute. Na S Na S particles The charge required for the reduction of 1 mole of Mn 4 to Mn is (A) 1 F (B) F (C) 5 F (D) 7 F Mn Mn 7 4 e F 4 7. For the reaction, S S, the rate of disappearance of is 10 4 mol L 1 s 1. The rate of appearance of S is (A) 10 4 mol L 1 s 1 (C) mol L 1 s 1 [ ] 4 10 f [S ] [ ] t t mol l s (B) mol L 1 s 1 (D) mol L 1 s 1 8. Which of the following electrolytes will have maximum coagulating value for AgI/Ag + sol? (A) Na S (B) Na P 4 (C) Na S 4 (D) NaC1 7

8 Coagulation value AgI / Ag 1 charge on the ion is positive colloid Negative ions with minimum negative charge has maximum coagulating value. NaCl has maximum coagulation value. 9. Electrolytic refining is used to purify which of the following metals? (A) Cu and Zn (C) Zr and Ti (B) Ge and Si (D) Zn and g Less reactive metals like Cu and Zn are purified by electrolytic refining. 40. Dry ice is (A) Solid C (B) Solid S (C) Solid C (D) Solid Dry ice is solid C. 41. Which of the following is an amphoteric oxide? (A) V 5, Cr (B) Mn 7, Cr (C) Cr, V 5 (D) V 5, V 4 5 V, Cr 5 4. The IUPAC name of [Co(N ) 4 Cl(N )]Cl is (A) tetraamminechloridonitrito-n-cobalt(iii) chloride (B) tetraamminechloridonitrocobalt(ii) chloride (C) tetraamminechloridonitrocobalt(i) chloride (D) tetraamminechloridodinitrocobalt(iii) chloride 4. Which of the following statements is true in case of alkyl halides? (A) They are polar in nature. (B) They can form hydrogen bonds (C) They are highly soluble in water (D) They undergo addition reactions Alkyl halides are polar in nature due to difference in electronegativity between carbon and halogen. 44. Phenol can be distinguished from ethanol by the reagent (A) Bromine water (B) Sodium metal (C) Iron metal (D) Chlorine water Chemistry K CET

9 + Br Br Br + Br Br,4,6-tribromophenol (white ppt) C Br No white ppt 45. Which of the following compounds undergoes haloform reaction? (A) C (B) C (C) C Br (D) Methyl ketones undergo haloform reaction. 46. Which of the following will be the most stable diazonium salt (R N X ) (A) CN X (B) C65N X (C) CCNX Arenediazonium salts are more stable due to resonance.? C C N X (D) Which of the following bases is not present in DNA? (A) Adenine (B) Guanine (C) Cytosine (D) Uracil Uracil is present in only RNA 48. Which one of the following is a polyamide polymer? (A) Terylene (B) Nylon-6,6 (C) Buna-S (D) Bakelite Amide linkage N (C ) 6 NC (C ) 4 C Nylon-6,6 49. In F.C.C. the unit cell is shared equally by how many unit cells? (A) 10 (B) 8 (C) 6 (D) The question is ambiguous. n 50. At a particular temperature, the ratio of molar conductance to specific conductance of 0.01 M NaCl solution is (A) 10 5 cm mol 1 (B) 10 cm mol 1 (C) 10 cm mol 1 (D) 10 5 cm mol 1 k m 1000 c m cm mol k

10 51. Isotonic solutions are solutions having the same (A) Surface tension (B) Vapour pressure (C) smotic pressure (D) Viscosity 5. The temperature coefficient of a reaction is. When the temperature is increased from 0 C to 90 C, the rate of reaction is increased by (A) 150 times (B) 410 times (C) 7 times (D) 64 times Increase in temperature T = 6 = Gold sol is not a (A) Lyophobic sol (C) Macromolecular sol It is not a Macromolecular sol. (B) Negatively charged sol (D) Multimolecular colloid 54. The common impurity present in bauxite is (A) Cu (B) Zn (C) Fe (D) Cr 55. Very pure N can be obtained by (A) Thermal decomposition of ammonium dichromate (B) Treating aqueous solution of N 4 Cl and NaN (C) Liquifaction and fractional distillation of liquid air (D) Thermal decomposition of sodium azide NaN Na N (s) (g) Pure 56. Which of the following oxidation states is common for all lanthanides? (A) + (B) + (C) + 4 (D) The electronic configuration of transition element X, is +, oxidation state is [Ar]d 5. What is its atomic number? (A) 5 (B) 6 (C) 7 (D) 4 X + [Ar]d 5 : No of electrons = = + oxidation state = + = 6 = z Chemistry K CET

11 58. n-propyl chloride reacts with sodium metal in dry ether to give (A) C C C C (B) C (C) C C (D) C C C C C C C C Cl Na Cl C C C dry C C C C C C ether n propylchloride n exane 59. When the vapours of tertiary butyl alcohol are passed through heated copper at 57 K, the product formed is (A) But--ene (B) -Butanone (C) -Methyl propene (D) Butanal C Cu 57 K C C -methylpropene 60. What is the increasing order of acidic strength among the following? (i) p-methoxy phenol (ii) p-methyl phenol (iii) p-nitro phenol (A) ii < iii < i (B) iii < ii < i (C) i < ii < iii (D) i < iii < ii < < N (I) (II) (III) * * * 11

KCET-2018 CHEMISTRY (VERSION CODE-B)

KCET-2018 CHEMISTRY (VERSION CODE-B) VIKAS PRE UNIVERSITY LLEGE, MANGALURU KET-08 EMISTRY (VERSIN DE-B). is (a) An oxidising agent (c) Both xidising and reducing agent. Dead burnt plaster is B) A reducing agent D) Neither oxidising nor reducing