CHEMISTRY. ion is : 62. Which of the following salts is the most basic in aqueous solution?

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1 JEE MAIN-018 CHEMISTRY This section contains 0 multiple choice questions. Each question has choices, (), () and for its answer, out of which Only One is correct. 61. Total number of lone pair of electrons in I ion is : 9 () 1 () 6 6. Which of the following salts is the most basic in aqueous solution? FeCl () PbCHCOO () Al CN CHCOOK 6. Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. A react with Br to form product B. A and B are respectively: () 1

2 () 6. The increasing order of basicity of the following compounds is : (a) (b) (c) (d) b a d c () d b a c () a b c d b a c d

3 65. An alkali is titrated against an acid with methyl orange as indictor, which of the following is a correct combination? Base Acid End point Weak Strong Yellow to pinkish red () Strong Strong Pink to colourless () Weak Strong Colourless to pink Strong Strong Pinkish red to yellow 66. The trans-alkenes are formed by the reduction of alkynes with : Na liq.nh () Sn HCl () H Pd C,BaSO NaBH 67. The ratio of mass percent of C and H of an organic compound CXHYO Z is 6:1. If X Y Z one molecule of the above compound C H O contains half as much oxygen as required to burn one molecule of compound CXH Y completely to CO and HO.The empirical formula of compound CXHYO Z is : CHO () CHO () CH6O CHO

4 68. Hydrogen peroxide oxidises FeCN 6 to FeCN 6 reduces FeCN 6 to FeCN are, respectively. H Oand H O O () HOandHO OH () H O O andh O HO O andho OH in acidic medium but 6 in alkaline medium. The other products formed 69. The major product formed in the following reaction is : () ()

5 70. How long (apporoximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 7.66g of diborane? (Atomic weight of B 10.8u ). hours () 1.6hours () 6. hours 0.8 hours 71. Which of the following lines correctly show the temperature dependence of equilibrium constant, K, for an exothermic reaction? C and D () A and D () A and B Band C 7. At 518 C, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 6 Torr, was 1.00 Torr s 1 when 5% had reacted and 0.5 Torr s 1 when % had reacted. The order of the reaction is : 1 () 0 () 5

6 7. Glucose on prolonged heating with HI gives : Hexanoic acid () 6 -iodohexanal () n -Hexane 1-Hexene 7. Consider the following reaction and statements : Co NH Br Br Co NH Br NH (I)Two isomers are produced if the reactant complex ion is a cis-isomer. (II) Two isomers are produced if the reactant complex ion is a tran-isomer. (III) Only one isomer is produced if the reactant complex ion is a trans-isomer. (IV) Only one isomer is produced if the reactant complex ion is a cis-isomer. The correct statements are : (III) and (IV) () (II) and (IV) () (I) and (II) (I) and (III) 6

7 75. The major product of the following reaction is : () () 76. Phenol on treatment with CO in the presence of NaOH followed by acidification produces compound X as the major product. X on treatment with CHCO O in the presence of catalytic amount of HSO produces : 7

8 () () 77. An aqueous solution contains an unknown concentration of Ba. When 50mL of a 1M solution of Na SO is added, BaSO just begins to precipitate. The final volume is 500mL. The solubility product of BaSO is What is the original concentration of Ba M () M () M 9 10 M 8

9 78. Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation? () () 79. When metal ' M ' is treated with NaOH, a white gelatinous precipitate ' X ' is obtained, which is soluble in excess of NaOH. Compound ' X ' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ' M ' is : Al () Fe () Zn Ca 80. An aqueous solution contains 0.10M HS and 0.0M HCl. If the equilibrium constant for the formation of HS from HS is then the concentration of () () and that of S from S ions in aqueous solution is : HS ions is 9

10 81. The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to made teeth enamel harder by converting Ca PO Ca OH to : Ca PO CaF () Ca OH CaF () CaF CaF Ca OH 8. The compound that does not produce nitrogen gas by the thermal decomposition is : NHNO () NH SO () Ba N NH Cr O 7 8. The predominant form of histamine present in human blood is ( pk, Histidine a 6.0 ) () 10

11 () 8. The oxidation states of Cr in Cr H O Cl, Cr C H K Cr CN O O NH, 0, and , and respectively are : (), 0, and (),, and 6,, and 85. Which type of 'defect' has the presence of cations in the interstitial sites? Frenkel defect () Metal deficiency defect () Schottky defect Vacancy defect 11

12 86. The combustion of benzene (I) gives CO g and combustion of benzene at constant volume is 1 combustion 60 () 67.6 () H O l. Given that heat of 1 6.9kJ mol at 5 C ; heat of in kj mol 1 1 of benzene at constant pressure will be : R 8.1JK mol 87. Which of the following are Lewis acids? PHandSiCl () BCland AlCl () PHand BCl AlClandSiCl 88. Which of the following compounds contain(s) no covalent bond(s)? KCl,PH,O,BH 6,HSO KCl () KCl,BH 6 () KCl,BH 6,PH KCl, HSO 1

13 89. For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point? Co HO Cl Cl.HO () Co HO Cl HO () CoH O Cl CoH O 6 ClCl 5.H O 90. According to molecular orbital theory, which of the following will not be a viable molecule? H () H () He He 1