question_answer1) Oxidation state of sulphur in anions \[\operatorname{S}\operatorname{O}_{3}^{2-},{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-},\] and \[{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}\] increases in the orders: JEE Main Online Paper (Held On 22 April 2013)
A) \[{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-}<\operatorname{S}\operatorname{O}_{3}^{2-}\] done clear
B) \[\operatorname{S}\operatorname{O}_{3}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}\] done clear
C) \[{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-}<\operatorname{S}\operatorname{O}_{3}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}\] done clear
D) \[{{S}_{2}}O_{4}^{2-}<{{S}_{2}}O_{6}^{2-}<SO_{3}^{2-}\] done clear
View Answer play_arrowquestion_answer2) A major component of Borsch regent is obtained by reacting hydrazine hydrate with of the following? JEE Main Online Paper (Held On 22 April 2013)
A) 
done
clear
B) 
done
clear
C) 
done
clear
D) 
done
clear
question_answer3) Given Reaction Energy Change (in KJ) \[\operatorname{L}\operatorname{i}(\operatorname{s})\to \operatorname{Li}(g)\] 161 \[\operatorname{L}\operatorname{i}(g)\to {{\operatorname{Li}}^{+}}(g)\] 520 \[\frac{1}{2}{{\operatorname{F}}_{2}}(g)\to \operatorname{F}(g)\] 77\[{{\operatorname{F}}_{2}}(g)+{{e}^{-}}\to {{\operatorname{F}}^{-}}(g)\] (Electron gain enthalpy) \[\operatorname{L}{{\operatorname{i}}^{+}}(g)+{{\operatorname{F}}^{-}}(g)\to Li\,\,\operatorname{F}(s)\] -1047 \[\operatorname{L}\operatorname{i}(\operatorname{s})+\frac{1}{2}{{\operatorname{F}}_{2}}(g)\to \operatorname{Li}\operatorname{F}(s)\] -617 Based on data provided, the value of electron gain enthalpy of fluorine would be: JEE Main Online Paper (Held On 22 April 2013)
A) \[-300\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\] done clear
B) \[-350\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\] done clear
C) \[-328\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\] done clear
D) \[-228\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\] done clear
View Answer play_arrowquestion_answer4) A molecule M associates in given solvent according to the equation \[\operatorname{M}\underset{{}}{\overset{{}}{\longleftrightarrow}}{{(\operatorname{M})}_{\operatorname{n}.}}\] For a certain concentration of M, The van? t Hoff factor was found to 0.9 and the fraction of associated molecules was 0.2 The value of n is: JEE Main Online Paper (Held On 22 April 2013)
A) 3 done clear
B) 5 done clear
C) 2 done clear
D) 4 done clear
View Answer play_arrowquestion_answer5) The solubility order for alkali metal fluoride in water is: JEE Main Online Paper (Held On 22 April 2013)
A) LiF < RbF < KF < NaF done clear
B) RbF < KF < NaF < LiF done clear
C) LiF > NaF > KF > RbF done clear
D) LiF < NaF < KF < RbF done clear
View Answer play_arrowquestion_answer6) \[\text{Xe}{{\operatorname{O}}_{4}}\] molecule is tetrahedral having: JEE Main Online Paper (Held On 22 April 2013)
A) Two \[p\pi -d\pi \] bonds done clear
B) One \[p\pi -d\pi \] bond done clear
C) Four \[p\pi -d\pi \] bonds done clear
D) Three \[p\pi -d\pi \] bonds done clear
View Answer play_arrowquestion_answer7) The reaction \[\operatorname{X}\to \operatorname{Y}\] is an exothermic reaction. Activation energy of the reaction for X into \[\operatorname{Y}\] is 150 \[150\operatorname{K}\operatorname{J}{{\operatorname{mol}}^{-1}}\]. Enthalpy of reaction is \[135\operatorname{K}\operatorname{J}{{\operatorname{mol}}^{-1}}\]. The activation energy for the reverse reaction, \[\operatorname{Y}\to \operatorname{X}\] will be: JEE Main Online Paper (Held On 22 April 2013)
A) \[280\operatorname{kJ}{{\operatorname{mol}}^{-1}}\] done clear
B) \[285\operatorname{kJ}{{\operatorname{mol}}^{-1}}\] done clear
C) \[270\operatorname{kJ}{{\operatorname{mol}}^{-1}}\] done clear
D) \[15\operatorname{kJ}{{\operatorname{mol}}^{-1}}\] done clear
View Answer play_arrowquestion_answer8) For which of the following compounds Kjeldahl method can be used to determine the percentage of Nitrogen? JEE Main Online Paper (Held On 22 April 2013)
A) Nitrobenzene done clear
B) Pyridine done clear
C) Alanine done clear
D) Diazomethane done clear
View Answer play_arrowquestion_answer9) Which of the following statements about aspirin is not true JEE Main Online Paper (Held On 22 April 2013)
A) It is effective in reliving pain done clear
B) It is a neurologically active drug done clear
C) It has antiblood clotting action done clear
D) It belongs to narcotic analgesics done clear
View Answer play_arrowquestion_answer10) The density of 3M solution of sodium chloride is 1.252\[~\text{gm}{{\text{L}}^{-1}}\]. The molality of the solution will be: (molar mass,\[\text{NaCI }=\text{85}.\text{5 g mo}{{\text{l}}^{\text{-1}}}\]) JEE Main Online Paper (Held On 22 April 2013)
A) 2.60 m done clear
B) 2.18 m done clear
C) 2.79 m done clear
D) 3.00 m done clear
View Answer play_arrowquestion_answer11) Which of the following structures represents thymine? JEE Main Online Paper (Held On 22 April 2013)
A) 
done
clear
B) 
done
clear
C) 
done
clear
D) 
done
clear
question_answer12) The polymer used for optical lenses is: JEE Main Online Paper (Held On 22 April 2013)
A) polypropylene done clear
B) polyvinyl chloride done clear
C) polythene done clear
D) polymethyl methacrylate done clear
View Answer play_arrowquestion_answer13) Which of the following is diamagnetic? JEE Main Online Paper (Held On 22 April 2013)
A) \[[\operatorname{F}e{{({{\operatorname{CN}}_{6}})}^{3-}}\] done clear
B) \[{{[\operatorname{Co}(\operatorname{O}\operatorname{X})]}^{3-}}\] done clear
C) \[{{[\operatorname{Fe}{{\operatorname{F}}_{6}}]}^{3-}}\] done clear
D) \[{{[\operatorname{Co}{{\operatorname{F}}_{6}}]}^{3-}}\] done clear
View Answer play_arrowquestion_answer14) Bond order normally gives idea of stability of a molecular species. All the molecules viz. \[{{\operatorname{H}}_{2}},\] \[\operatorname{L}{{\operatorname{i}}_{2}}\] and \[{{\operatorname{B}}_{2}}\] have the same bond order yet they are not equally stable. The Their stability order is: JEE Main Online Paper (Held On 22 April 2013)
A) \[{{\text{H}}_{\text{2}}}>{{\text{B}}_{\text{2}}}>\text{L}{{\text{i}}_{\text{2}}}\] done clear
B) \[\text{L}{{\text{i}}_{\text{2}}}\text{}{{\text{H}}_{\text{2}}}>{{\text{B}}_{\text{2}}}\] done clear
C) \[{{\operatorname{Li}}_{2}}>{{\text{B}}_{\text{2}}}>{{\operatorname{H}}_{2}}\] done clear
D) \[{{\text{B}}_{\text{2}}}>{{\operatorname{H}}_{2}}>{{\operatorname{Li}}_{2}}\] done clear
E) (e) None of these done clear
View Answer play_arrowquestion_answer15) Which one of the following arrangements represents the correct order of solubilities of sparingly soluble soluble salts\[\operatorname{H}{{\operatorname{g}}_{2}}{{\operatorname{CI}}_{2}},C{{r}_{2}}{{(S{{O}_{4}})}_{3}},\]\[BaS{{O}_{4}}\] and \[\text{CrC}{{\text{l}}_{3}}\] respectively? JEE Main Online Paper (Held On 22 April 2013)
A) \[BaS{{O}_{4}}>H{{g}_{2}}C{{l}_{2}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}>CrC{{l}_{3}}\] done clear
B) \[BaS{{O}_{4}}>H{{g}_{2}}C{{l}_{2}}>CrC{{l}_{3}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
C) \[BaS{{O}_{4}}>CrC{{l}_{3}}>H{{g}_{2}}C{{l}_{2}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
D) \[H{{g}_{2}}C{{l}_{2}}>BaS{{O}_{4}}>CrC{{l}_{3}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
View Answer play_arrowquestion_answer16) The wave number of the first emission line in the Balmer series of H-Spectrum is: (R= Rydberg constant): JEE Main Online Paper (Held On 22 April 2013)
A) \[\frac{5}{36}\operatorname{R}\] done clear
B) \[\frac{9}{400}\operatorname{R}\] done clear
C) \[\frac{7}{6}\operatorname{R}\] done clear
D) \[\frac{3}{4}\operatorname{R}\] done clear
View Answer play_arrowquestion_answer17) What is the structure of the major product when phenol is treated with bromine water? JEE Main Online Paper (Held On 22 April 2013)
A) 
done
clear
B) 
done
clear
C) 
done
clear
D) 
done
clear
question_answer18) \[NaOH\] is a strong base. What will be pH of \[5.0\times {{10}^{-2}}\,M\,\,NaOH\] solution? \[(\log \,2\,=\,0.3)\] JEE Main Online Paper (Held On 22 April 2013)
A) 14.00 done clear
B) 13.70 done clear
C) 13.00 done clear
D) 12.70 done clear
View Answer play_arrowquestion_answer19) Flocculation value of \[BaC{{l}_{2}}\] is much less then that of \[KCl\] for sol A and flocculation value of \[\operatorname{N}{{\operatorname{a}}_{2}}\operatorname{S}{{\operatorname{O}}_{4}}\] is much less than that of \[\text{NaBr}\]for sol B. The correct statement among the following is: JEE Main Online Paper (Held On 22 April 2013)
A) Both the sols A and B are negatively charged done clear
B) Sol A is positively charged and Sol B is negatively charged done clear
C) Both the sols A and B are positively charged done clear
D) Sol A is negatively charged and sol B is positively charged done clear
View Answer play_arrowquestion_answer20) Amongst the following alcohols which would react fastest with conc. HCI and \[ZnC{{l}_{2}}\]? JEE Main Online Paper (Held On 22 April 2013)
A) pentanol done clear
B) 2-methylbutanol done clear
C) 2-pentanol done clear
D) 2-methy lbutan-2ol done clear
View Answer play_arrowquestion_answer21) Values of dissociation constant, \[{{\text{K}}_{\text{a}}}\]are given as follows: Acid \[{{\text{K}}_{\text{a}}}\] \[\operatorname{HCN}\] \[6.2\times {{10}^{-10}}\] \[HF\] \[7.2\times {{10}^{-4}}\] \[HN{{O}_{2}}\] \[4.0\times {{10}^{-4}}\] Correct order of increasing base strength of the base \[{{\operatorname{CN}}^{-}},{{\operatorname{F}}^{-}}\] and \[\operatorname{NO}_{2}^{-}\]will be: JEE Main Online Paper (Held On 22 April 2013)
A) \[{{\operatorname{F}}^{-}}<{{\operatorname{CN}}^{-}}<\operatorname{NO}_{2}^{-}\] done clear
B) \[NO_{2}^{-}<C{{N}^{-}}<{{F}^{-}}\] done clear
C) \[{{\operatorname{F}}^{-}}<\operatorname{NO}_{2}^{-}<{{\operatorname{CN}}^{-}}\] done clear
D) \[\operatorname{NO}_{2}^{-}<\operatorname{F}_{{}}^{-}<\operatorname{CN}_{{}}^{-}\] done clear
View Answer play_arrowquestion_answer22) Clemmensen reduction of a ketone is carried out in the presence of : JEE Main Online Paper (Held On 22 April 2013)
A) \[LiAl{{H}_{4}}\] done clear
B) \[Zn-Hg\] with \[HCl\] done clear
C) Glycol with \[KOH\] done clear
D) \[{{H}_{2}}\] with \[Pt\] as catalyst done clear
View Answer play_arrowquestion_answer23) Which of the following statements is incorrect? JEE Main Online Paper (Held On 22 April 2013)
A) \[\operatorname{F}{{\operatorname{e}}^{2}}^{+}\]ion also gives blood red colour with \[{{\operatorname{SCN}}^{-}}\]ion done clear
B) \[F{{e}^{3+}}\]ion given blood red colour with \[SC{{N}^{-}}\] ion. done clear
C) On Passing \[{{H}_{2}}S\] into \[N{{a}_{2}}Zn{{O}_{2}}\] solution, a white ppt of \[ZnS\] is formed done clear
D) Cupric ion react with excess of ammonia solution to give deep blue colour of \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] ion. done clear
View Answer play_arrowquestion_answer24) The Order of increasing sizes of atomic radii among the elements O, S, Se and As is: JEE Main Online Paper (Held On 22 April 2013)
A) \[As-S<O<Se\] done clear
B) \[Se<S<As<O\] done clear
C) \[O<S<As<Se\] done clear
D) \[O<S<Se<As\] done clear
View Answer play_arrowquestion_answer25) In Williamason synthesis of mixed ether having a primary and a tertiary alkyl group if tertiary halide is used, then: JEE Main Online Paper (Held On 22 April 2013)
A) Rate of reaction will be slow due to slow cleavage of carbon ? halogen bond done clear
B) Alkene will be the main product done clear
C) Simple ether will form instead of mixed ether done clear
D) Expected mixed ether will be formed done clear
View Answer play_arrowquestion_answer26) Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction? JEE Main Online Paper (Held On 22 April 2013)
A) 1-butene + HF done clear
B) 2-butanol+ \[{{\operatorname{H}}_{2}}{{\operatorname{SO}}_{4}}\] done clear
C) Butanoykhloride \[+AlC{{l}_{3}}\] then \[Zn,\,HCl\] done clear
D) Butyl chloride \[+AlC{{l}_{3}}\] done clear
View Answer play_arrowquestion_answer27) Arrange in the correct order of stability (decreasing order) for the following molecules : 
JEE Main Online Paper (Held On 22 April 2013)
A) (I) > (II) > (III) > (IV) done clear
B) (IV) > (III) > (II)\[\approx \](I) done clear
C) (I) > (II) \[\approx \] (III) > (IV) done clear
D) (III) > (I) \[\approx \] (II) > (IV) done clear
View Answer play_arrowquestion_answer28) Which one of the following statements about packing in solids in incorrect? JEE Main Online Paper (Held On 22 April 2013)
A) Coordination number in bee mode of packing is 8 done clear
B) Coordination number in hcp mode of packing is 12. done clear
C) Void space in hcp mode of packing is 32% done clear
D) Void space in ccp mode of packing in 26% done clear
View Answer play_arrowquestion_answer29) The Wurtz-Fitting reaction involues condensation of: JEE Main Online Paper (Held On 22 April 2013)
A) two molecules of aryl halides done clear
B) one molecule of each of aryl- halide and phenol done clear
C) one molecule of each aryl-halide and phenol done clear
D) two molecules of aralkyl-halides done clear
View Answer play_arrowquestion_answer30) In Goldschmidt alumino thermic process which of the following reducing agents is used: JEE Main Online Paper (Held On 22 April 2013)
A) calcium done clear
B) coke done clear
C) AI- powder done clear
D) sodium done clear
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