MHT-CET 8 (CHEMISTRY) CHEMISTRY SOLUTION CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 1
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1 CHEMISTRY SOLUTION 51. (C) The structure of oxoacids of chlorine are given below: 5. (A) 53. (C) Equivalent conductance, k 1000 e C 1 l R a Caq = 46 ohm 1 cm.equiv 1 COOH H C OH eq CH3 Presence of an asymmetric carbon atom (marked *) in lactic acid results in optical isomerism. 54. (B) Chromate ion h as tetrahedral structure. Cr atom is at centre and four oxygen atoms are at four corners of a tetrahedron. CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 1
2 55. (B) 56. (D) By the same reaction ethylene would give ethyl alcohol, propylene gives isopropyl alcohol and n-butylene gives secondary butyl alcohol. 57. (D) Phthalic acid: 58. (B) Q = I t = = 147 C. 59. (B) HBF4 C H N X C H N BF C H NO N NaBF 60. (C) NaNO /Cu Bensene diazonium chloride Nitrobenzene 61. (B) The carbonyl carbon forms three sigma bonds and one pi bond. 6. (B) Chlorine reacts with water (present in moisture) to form nascent oxygen which oxidizes the vegetable colouring matter to a colourless product. CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI #
3 63. (C) 64. (D) Species Oxidation number of Mn MnO +4 MnO 4 +6 MnSO 4 + MnO +7 4 Hence, among the given species, the oxidation number of Mn is highest in MnO 4 ion. 65. (A) (D) (B) 68. (C) The rate law is rate = k[a] X (i) When concentration of A is increased by 1.5, the rate increases by a factor of.5.5 rate = k[1.5 A] X (ii) CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 3
4 69. (B) Divide (ii) by (i).5rate k[1.5a] rate k[a].5 = (1.5) x (1.5) = (1.5) x x = x 70. (D) 71. (B) 7. (B) 73. (D) 74. (B) SO 3 is an acidic oxide, Al O 3 is an amphoteric oxide, while MgO and Na O are basic oxides. CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 4
5 75. (B) H O and NH 3 are monodenatete ligands. EDTA is a hexadentate ligand. bidentate ligand as it contains two points of attachment with a metal ion. CO 4 (oxalate) is a 76. (B) In phenol (carbolic acid), the OH group is attached to sp transition elements. hybridised carbon to 3d series of 77. (A) 78. (A) The atom with electronic configuration 1s s p 6 3s 3p 6 3d 3 4s has incompletely filled 3d orbital. Hence, it belongs to 3d series of transition elements. 79. (A) But ene is a symmetrical alkene and thus, does not follow Markownikoff s rule. 80. (B) 81. (C) 8. (A) 83. (C) ΔT f = K f m If m = 1, then ΔT f = K f. Therefore, for 1.0 m glucose solution, the depression in freezing point equals the cryoscopic constant for the solvent. 84. (C) 85. (A) When alcohol reacts with concentrated H SO 4, intermediate compound formed is carbonium ion. CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 5
6 86. (A) In all cases intermediate is carbonium ion, and there may be 1, -methyl shift to form more stable carbonium ion. 87. (B) ΔH c for food material = y kj. Thus, y kj energy is obtained from 100g food. x KJ energy will be obtained from 100 y x g food. Daily consumption of food = x y (B) HOOC CH COOH Malonic acid Pr opanedioic acid Sulphuric acid, oxalic acid, malonic acid, hydrosulphuric acid, etc. are diprotic acids these acids produce two acid hydrogens per molecule on dissociation. 89. (B) In the aryl halides, the partial double bond character (acquired due to resonance) results in large amount of energy being required to break C X bond. As a result, aryl halides are less reactive than alkyl halides. 90. (A) Amines pk b Values Methanamine [CH 3 NH ] 3.38 N-methylmethanamine [(CH 3 ) NH] 3.7 N,N-Dimethyl methanamine [(CH 3 ) 3 N] 4. Benzenamine [C 6 H 5 NH ] 9.38 Strong bases have high values of K b and low values of pk b. Among the given options C 6 H 5 NH is least basic due to resonance whereas (CH 3 ) NH is most basic due to combined effect of solvation and inductive effect and thus, has smallest pk b value. 91. (A) 3 Volume = 1liter = 10 c. c Density = 1 g / c. c. 9. (A) 3 mass of water = 10 g 18g of water =1 mole 100 g of water = moles CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 6
7 93. (C) 94. (A) 95. (C) Let oxidation number of oxygen in x x (C) 97. (A) 98. (B) 99. (C) 100. (C) O be x CENTERS: MUMBAI /DELHI / AKOLA / LUCKNOW / NASHIK /PUNE /NAGPUR / BOKARO /DUBAI # 7
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