Iit 2013 Question Paper
CODE-P
JEE(MAIN) – 2013 TEST PAPER WITH ANSWER (HELD ON SUNDAY 07th APRIL, 2013)
PART B – CHEMISTRY
Which of the following complex species is not expected to exhibit optical isomerism ? (1) [Co(en)3]3+ (2) [Co(en)2 Cl 2]+ (3) [Co(NH3)3 Cl3] (4) [Co(en) (NH3)2Cl2]+ Ans. (3) 32. Which one of the following molecules is expected to exhibit diamagnetic behaviour ? (2) N2 (1) C2 (3) O2 (4) S2 Ans. (2) 33. A solution of (–) –1–chloro–1–phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :(1) carbanion (2) Carbene (3) carbocation (4) free radical Ans. (3) 34. Given : 31.
E0
Cr 3 / Cr
The molarity of a solution obtained by mixing 750 mL of 0.5(M)HCl with 250 mL of 2(M)HCl will be :(1) 0.875 M (2) 1.00 M (3) 1.75 M (4) 0.975 M Ans. (1) 37. Arrange the following compounds in order of decreasing acidity : 36.
OH ; Cl (I)
OH ; CH3 (II)
OH ; NO2 (III)
OH
1.51 V
OCH3 (IV)
E0
Cr2 O2 / Cr 3 7
MnO4 / Mn2
0.74 V ; E 0
1.33 V ; E 0 / Cl 1.36 V Cl
(1) II > IV > I > III (2) I > II > III > IV (3) III > I > II > IV (4) IV > III > I > II Ans. (3) 38. For gaseous state, if most probable speed is denoted by C*, average speed by C and mean square speed by C, then for a large number of molecules the ratios of these speeds are :(1) C* : C : C = 1.225 : 1.128 : 1 (2) C* : C : C = 1.128 : 1.225 : 1 (3) C* : C : C = 1 : 1.128 : 1.225 (4) C* : C : C = 1 : 1.225 : 1.128 Ans. (3) 39. The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be (R = 8.314 JK–1 mol–1 and log 2 = 0.301) (1) 53.6 kJ mol–1 (2) 48.6 kJ mol–1 (3) 58.5 kJ mol–1 (4) 60.5 kJ mol–1 Ans. (1)
Based on the data given above, strongest oxidising agent will be : (1) Cl– (2) Cr3+ 2+ (3) Mn (4) MnO4– Ans. (4) 35. A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As
JEE(MAIN) – 2013 TEST PAPER WITH ANSWER (HELD ON SUNDAY 07th APRIL, 2013)
PART B – CHEMISTRY
Which of the following complex species is not expected to exhibit optical isomerism ? (1) [Co(en)3]3+ (2) [Co(en)2 Cl 2]+ (3) [Co(NH3)3 Cl3] (4) [Co(en) (NH3)2Cl2]+ Ans. (3) 32. Which one of the following molecules is expected to exhibit diamagnetic behaviour ? (2) N2 (1) C2 (3) O2 (4) S2 Ans. (2) 33. A solution of (–) –1–chloro–1–phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :(1) carbanion (2) Carbene (3) carbocation (4) free radical Ans. (3) 34. Given : 31.
E0
Cr 3 / Cr
The molarity of a solution obtained by mixing 750 mL of 0.5(M)HCl with 250 mL of 2(M)HCl will be :(1) 0.875 M (2) 1.00 M (3) 1.75 M (4) 0.975 M Ans. (1) 37. Arrange the following compounds in order of decreasing acidity : 36.
OH ; Cl (I)
OH ; CH3 (II)
OH ; NO2 (III)
OH
1.51 V
OCH3 (IV)
E0
Cr2 O2 / Cr 3 7
MnO4 / Mn2
0.74 V ; E 0
1.33 V ; E 0 / Cl 1.36 V Cl
(1) II > IV > I > III (2) I > II > III > IV (3) III > I > II > IV (4) IV > III > I > II Ans. (3) 38. For gaseous state, if most probable speed is denoted by C*, average speed by C and mean square speed by C, then for a large number of molecules the ratios of these speeds are :(1) C* : C : C = 1.225 : 1.128 : 1 (2) C* : C : C = 1.128 : 1.225 : 1 (3) C* : C : C = 1 : 1.128 : 1.225 (4) C* : C : C = 1 : 1.225 : 1.128 Ans. (3) 39. The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be (R = 8.314 JK–1 mol–1 and log 2 = 0.301) (1) 53.6 kJ mol–1 (2) 48.6 kJ mol–1 (3) 58.5 kJ mol–1 (4) 60.5 kJ mol–1 Ans. (1)
Based on the data given above, strongest oxidising agent will be : (1) Cl– (2) Cr3+ 2+ (3) Mn (4) MnO4– Ans. (4) 35. A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As