Solved papers for JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)
done JEE Main Paper (Held On 22 April 2013) Total Questions - 30
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)
question_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)
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)
question_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)
question_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)
question_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)
question_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)
question_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)
question_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)
question_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)
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)
question_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
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B)
Sol A is positively charged and Sol B is negatively charged
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C)
Both the sols A and B are positively charged
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D)
Sol A is negatively charged and sol B is positively charged
question_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)
question_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)
question_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
question_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)
question_answer27) Arrange in the correct order of stability (decreasing order) for the following molecules :
JEE Main Online Paper (Held On 22 April 2013)
question_answer30) In Goldschmidt alumino thermic process which of the following reducing agents is used:
JEE Main Online Paper (Held On 22 April 2013)