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question_answer1) In a face centered cubic lattice atoms A are at the corner points and atoms B at the face centered points. If atom B is missing from one of the face centered points, the formula of the ionic compound is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[A{{B}_{2}}\]
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B)
\[{{A}_{5}}{{B}_{2}}\]
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C)
\[{{A}_{2}}{{B}_{3}}\]
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D)
\[{{A}_{2}}{{B}_{5}}\]
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question_answer2) Van der Waal's equation for a gas is stated as, \[p=\frac{nRT}{V-nb}-a{{\left( \frac{n}{V} \right)}^{2}}.\] This equation reduces to the perfect gas equation,\[p=\frac{nRT}{V}\]when,
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
temperature is sufficient high and pressure is low.
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B)
temperature is sufficient low and pressure is high.
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C)
both temperature and pressure are very high.
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D)
both temperature and pressure are very low.
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question_answer3) The standard electrode potentials \[\left( E_{{{M}^{+}}/M}^{0} \right)\] of four metals A, B, C and D are - 1.2 V, 0.6 V, 0.85 V and - 0.76 V, respectively. The sequence of deposition of metals on applying potential is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
A, C, B, D
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B)
B, D, C, A
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C)
C, B, D, A
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D)
D, A, B, C
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question_answer4) At a certain temperature, only 50% HI is dissociated into \[{{H}_{2}}\]and \[{{I}_{2}}\] at equilibrium. The equilibrium constant is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
1.0
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B)
3.0
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C)
0.5
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D)
0.25
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question_answer5) Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
1.00M
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B)
2.00 M
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C)
2.50 M
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D)
4.00 M
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question_answer6) The half-life period of a first order reaction is 15 minutes. The amount of substance left after one hour will be:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[\frac{1}{4}\]of the original amount
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B)
\[\frac{1}{8}\]of the original amount
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C)
\[\frac{1}{16}\]of the original amount
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D)
\[\frac{1}{32}\]of the original amount
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question_answer7) A current of 10.0 A flows for 2.00 h through an electrolytic cell containing a molten salt of metal X. This results in the decomposition of 0.250 mol of metal X at the cathode. The oxidation state of X in the molten salt is: (F = 96,500 C)
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
1+
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B)
2 +
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C)
3+
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D)
4 +
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question_answer8) The energy of an electron in first Bohr orbit of H-atom is -13.6 eV. The energy value of electron in the excited state of\[L{{i}^{2+}}\]is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
27.2 eV
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B)
30.6 eV
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C)
30.6 eV
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D)
27.2 eV
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question_answer9) The temperature at which oxygen molecules have the same root mean square speed as helium atoms have at 300 K is: Atomic masses: He = 4 u, O = 16 u)
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
300 K
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B)
600 K
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C)
1200 K
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D)
2400 K
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question_answer10) The standard enthalpy of formation of \[N{{H}_{3}}\] is -46.0 kJ/mol. If the enthalpy of formation of \[{{H}_{2}}\] from its atoms is -436 kJ/mol and that of \[{{N}_{2}}\] is - 712 kJ/mol, the average bond enthalpy of N - H bond in \[N{{H}_{3}}\] is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
-1102 kJ/mol
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B)
- 964 kJ/mol
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C)
+ 352 kJ/mol
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D)
+ 1056 kJ/mol
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question_answer11) The amount of oxygen in 3.6 moles of water is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
115.2 g
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B)
57.6 g
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C)
28.8 g
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D)
18.4 g
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question_answer12) The gas evolved on heating \[Ca{{F}_{2}}\]and \[Si{{O}_{2}}\] with concentrated\[{{H}_{2}}S{{O}_{4}},\]on hydrolysis gives a white gelatinous precipitate. The precipitate is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
Hydro fluosilicic acid
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B)
silica gel
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C)
silicic acid
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D)
calcium fluorosilicate
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question_answer13) Chloro compound of Vanadium has only spin magnetic moment of 1.73 BM. This Vanadium chloride has the formula:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[VC{{l}_{2}}\]
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B)
\[VC{{l}_{4}}\]
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C)
\[VC{{l}_{3}}\]
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D)
\[VC{{l}_{5}}\]
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question_answer14) An octahedral complex of \[C{{o}^{3+}}\]is diamagnetic. The hybridisation involved in the formation of the complex is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[s{{p}^{3}}{{d}^{2}}\]
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B)
\[ds{{p}^{2}}\]
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C)
\[{{d}^{2}}s{{p}^{3}}\]
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D)
\[s{{p}^{3}}d\]
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question_answer15) Which of the following is not formed when \[{{H}_{2}}S\] reacts with acidic \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]solution?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[CrS{{O}_{4}}\]
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B)
\[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
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C)
\[{{K}_{2}}S{{O}_{4}}\]
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D)
\[S\]
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question_answer16) Which of the following has unpaired electron(s)?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[{{N}_{2}}\]
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B)
\[O_{2}^{-}\]
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C)
\[N_{2}^{2+}\]
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D)
\[N_{2}^{2-}\]
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question_answer17)
In the following sets of reactants which two sets best exhibit the amphoteric characters of \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O\]?
Set \[1:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[O{{H}^{-}}(aq)\]
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Set \[2:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[{{H}_{2}}O(l)\]
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Set \[3:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[{{H}^{+}}(aq)\]
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Set \[4:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[N{{H}_{3}}(aq)\]
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[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[1 and 2\]
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B)
\[1 and 3\]
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C)
\[2 and 4\]
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D)
\[3 and 4\]
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question_answer18) The number and type of bonds in \[C_{2}^{2-}\]ion in \[Ca{{C}_{2}}\] are:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
One \[\sigma \] bond and one \[\text{ }\!\!\pi\!\!\text{ -}\]bond
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B)
One \[\sigma \] bond and two \[\text{ }\!\!\pi\!\!\text{ -}\]bond
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C)
Two \[\sigma \] bond and two \[\text{ }\!\!\pi\!\!\text{ -}\]bond
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D)
Two \[\sigma \] bond and one \[\text{ }\!\!\pi\!\!\text{ -}\]bond
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question_answer19) The form of iron obtained from blast furnace is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
Steel
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B)
Cast Iron
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C)
Pig Iron
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D)
Wrought Iron
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question_answer20) Which one of the following reactions will not result in the formation of carbon-carbon bond?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
Reimer-Tie man reaction
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B)
Friedel Craft's acylation
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C)
Wurtz reaction
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D)
Cannizzaro reaction
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question_answer21) In the hydrocarboration - oxidation reaction of propene with diborane, \[{{H}_{2}}{{O}_{2}}\]and NaOH, the organic compound formed is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[C{{H}_{3}}C{{H}_{2}}OH\]
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B)
\[C{{H}_{3}}CHOHC{{H}_{3}}\]
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C)
\[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\]
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D)
\[{{(C{{H}_{3}})}_{3}}COH\]
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question_answer22)
The major product of the reaction
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
done
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B)
done
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C)
done
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D)
done
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question_answer23) For the compounds\[C{{H}_{3}}Cl,C{{H}_{3}}Br,C{{H}_{3}}I\]and \[C{{H}_{3}}F,\]the correct order of increasing C-halogen bond length is:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[C{{H}_{3}}F<C{{H}_{3}}Cl<C{{H}_{3}}Br<C{{H}_{3}}I\]
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B)
\[C{{H}_{3}}F<C{{H}_{3}}Br<C{{H}_{3}}CI<C{{H}_{3}}I\]
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C)
\[C{{H}_{3}}F<C{{H}_{3}}I<C{{H}_{3}}Br<C{{H}_{3}}Cl\]
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D)
\[C{{H}_{3}}Cl<C{{H}_{3}}Br<C{{H}_{3}}F<C{{H}_{3}}I\]
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question_answer24) Allyl phenyl ether can be prepared by heating:
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[{{C}_{6}}{{H}_{5}}Br+C{{H}_{2}}=CH-C{{H}_{2}}-ONa\]
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B)
\[C{{H}_{2}}=CH-C{{H}_{2}}-Br-{{C}_{6}}{{H}_{5}}ONa\]
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C)
\[{{C}_{6}}{{H}_{5}}-CH=CH-Br-C{{H}_{3}}-ONa\]
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D)
\[C{{H}_{2}}=CH-Br-{{C}_{6}}{{H}_{5}}-C{{H}_{2}}-ONa\]
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question_answer25) In a nucleophilic substitution reaction: \[R-Br+C{{l}^{-}}\xrightarrow[{}]{DMF}R-Cl+B{{r}^{-}},\]which one of the following undergoes complete inversion of configuration?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[{{C}_{6}}{{H}_{5}}CH{{C}_{6}}{{H}_{5}}Br\]
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B)
\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}Br\]
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C)
\[{{C}_{6}}{{H}_{5}}CHC{{H}_{3}}Br\]
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D)
\[{{C}_{6}}{{H}_{5}}CC{{H}_{3}}{{C}_{6}}{{H}_{5}}Br\]
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question_answer26) In which of the following pairs A is more stable than B?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
done
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B)
done
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C)
done
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D)
\[P{{h}_{3}}{{C}^{\bullet }},{{(C{{H}_{3}})}_{3}}{{C}^{\bullet }}\]
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question_answer27) Structure of some important polymers are given. Which one represents Buna-S?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
\[(-C{{H}_{2}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,=CH-C{{H}_{2}}-)n\]
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B)
\[(-C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ {{C}_{6}}{{H}_{5}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}\overline{n})\]
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C)
\[(-C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ CN \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}-)n\]
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D)
\[{{(-C{{H}_{2}}-\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{C}}\,=CH-C{{H}_{2}}-)}_{n}}\]
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question_answer28) Which is major product formed when acetone is heated with iodine and potassium hydroxide?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
Iodoacetone
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B)
Acetic acid
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C)
Iodoform
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D)
Acetophenone
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question_answer29) Which one of the following class of compounds is obtained by polymerization of acetylene?
[JEE Main Online Paper ( Held On 09 Apirl 2014 )
A)
Poly-yne
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B)
Poly-ene
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C)
Poly-ester
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D)
Poly-amine
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