Solved papers for JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)
done JEE Main Paper (Held On 22 April 2013)
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)
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 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)
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)
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)
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)
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)
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)
\[NaOH\] 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)
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
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)
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
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)