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question_answer1) If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[\frac{1}{2}\frac{{{e}^{2}}}{r}\]
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B)
\[-\frac{{{e}^{2}}}{r}\]
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C)
\[m{{e}^{2}}\]
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D)
\[1\,{{e}^{2}}\]
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question_answer2) The de-Broglie wavelength of a particle of mass 6.63 g moving with a velocity of 100 \[m{{s}^{-1}}\] is:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[{{10}^{-33}}m\]
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B)
\[{{10}^{-35}}m\]
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C)
\[{{10}^{-31}}m\]
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D)
\[{{10}^{-25}}m\]
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question_answer3) What happens when an inert gas is added to an equilibrium keeping volume unchanged?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
More product will form
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B)
Less product will form
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C)
More reactant will form
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D)
Equilibrium will remain unchanged
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question_answer4) The amount of \[BaS{{O}_{4}}\]formed upon mixing 100 mL of 20.8% \[{{H}_{2}}S{{O}_{4}}\] solution with 50 mL of 9.8% \[{{H}_{2}}S{{O}_{4}}\]solution with 50 mL of 9.8% \[{{H}_{2}}S{{O}_{4}}\] solution will be: (Ba = 137, Cl = 35.5, S = 32, H = 1 and O = 16)
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
23.3 g
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B)
11.65 g
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C)
30.6 g
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D)
33.2 g
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question_answer5) The rate coefficient (k) for a particular reactions is \[1.3\times {{10}^{-4}}{{M}^{-1}}\]\[{{s}^{-1}}\] at \[100{}^\circ C\], and \[1.3\times {{10}^{-3}}\] at \[150{}^\circ C\]. What is the energy of activation (EA) (in kJ) for this reaction? (R = molar gas constant\[=8.31J{{K}^{-1}}kJ\])
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
16
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B)
60
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C)
99
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D)
132
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question_answer6) How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate? (Atomic mass of copper \[=63.5u,{{N}_{A}}=\] Avogadro's constant):
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[\frac{{{N}_{A}}}{20}\]
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B)
\[\frac{{{N}_{A}}}{10}\]
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C)
\[\frac{{{N}_{A}}}{5}\]
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D)
\[\frac{{{N}_{A}}}{2}\]
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question_answer7) The \[\left( S{}^\circ \right)\] of the following substances are: \[C{{H}_{4}}(g)186.2J{{K}^{-1}}mo{{l}^{-1}}\] \[{{O}_{2}}(g)205.2J{{K}^{-1}}mo{{l}^{-1}}\] \[{{H}_{2}}O(g)69.9J{{K}^{-1}}mo{{l}^{-1}}\] The entropy change \[(\Delta {{S}^{o}})\]for the reaction : \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\to C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]is:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[-312.5J{{K}^{-1}}mo{{l}^{-1}}\]
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B)
\[-242.8J{{K}^{-1}}mo{{l}^{-1}}\]
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C)
\[-108.1J{{K}^{-1}}mo{{l}^{-1}}\]
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D)
\[-37.6J{{K}^{-1}}mo{{l}^{-1}}\]
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question_answer8) The conjugate base of hydrazoic acid is:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[{{N}^{-3}}\]
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B)
\[N_{3}^{-}\]
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C)
\[N_{2}^{-}\]
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D)
\[HN_{3}^{-}\]
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question_answer9) In a monoclinic unit cell, the relation of sides and angles are respectively:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[a=b\ne c\]and \[\alpha =\beta =\gamma ={{90}^{o}}\]
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B)
\[a\ne b\ne c\]and \[\alpha =\beta =\gamma ={{90}^{o}}\]
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C)
\[a\ne b\ne c\]and \[\beta =\gamma ={{90}^{o}}\ne \alpha \]
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D)
\[a\ne b\ne c\]and \[\alpha \ne \beta \ne \gamma \ne {{90}^{o}}\]
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question_answer10) The standard enthalpy of formation \[({{\Delta }_{f}}{{H}^{o}}_{298})\]for methane, \[C{{H}_{4}}\]is\[-74.9kJ\,mo{{l}^{-1}}.\]In order to calculate the average energy given out in the formation of a C ? H bond from this it is necessary to know which one of the following?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
The dissociation energy of the hydrogen molecule, \[{{H}_{2}}\].
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B)
The first four ionisation energies of carbon.
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C)
The dissociation energy of \[{{H}_{2}}\]and enthalpy and sublimation of carbon (graphite).
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D)
The first four ionisation energies of carbon and electron affinity of hydrogen.
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question_answer11) Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[Xe{{O}_{2}}{{F}_{2}}\]
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B)
\[XeO{{F}_{4}}\]
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C)
\[Xe{{O}_{3}}\]
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D)
\[Xe{{O}_{4}}\]
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question_answer12) Excited hydrogen atom emits light in the ultraviolet region at \[2.47\times {{10}^{15}}Hz.\]With this frequency, the energy of a single photon is: \[(h=6.63\times {{10}^{-34}}Js)\]
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[8.041\times {{10}^{-40}}J\]
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B)
\[2.680\times {{10}^{-19}}J\]
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C)
\[1.640\times {{10}^{-18}}J\]
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D)
\[6.111\times {{10}^{-17}}J\]
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question_answer13) Which one of the following exhibits the large number of oxidation states?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
Ti (22)
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B)
V (23)
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C)
Cr (24)
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D)
Mn (25)
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question_answer14) Copper becomes green when exposed to moist air for a long period. This is due to:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
the formation of a layer of cupric oxide on the surface of copper.
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B)
the formation of a layer of basic carbonate of copper on the surface of copper.
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C)
the formation of a layer of cupric hydroxide on the surface of copper.
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D)
the formation of basic copper sulphate layer on the surface of the metal.
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question_answer15) Among the following species the one which causes the highest \[CFSE,{{\Delta }_{0}}\]as a ligand is:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[C{{N}^{-}}\]
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B)
\[N{{H}_{3}}\]
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C)
\[{{F}^{-}}\]
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D)
CO
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question_answer16) Similarity in chemical properties of the atoms of elements in a group of the Periodic table is most closely related to:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
atomic numbers
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B)
atomic masses
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C)
number of principal energy levels
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D)
number of valence electrons
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question_answer17) Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species \[{{O}^{2-}},{{S}^{2-}},{{N}^{3-}},{{p}^{3-?}}\]
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[{{O}^{2-}}<{{N}^{3-}}<{{S}^{2-}}<{{p}^{3-}}\]
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B)
\[{{O}^{2-}}<{{p}^{3-}}<{{N}^{3-}}<{{S}^{2-}}\]
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C)
\[{{N}^{3}}<{{O}^{2-}}<{{p}^{3-}}<{{S}^{2-}}\]
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D)
\[{{N}^{3-}}<{{S}^{2-}}<{{O}^{2-}}<{{p}^{3-}}\]
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question_answer18) Global warming is due to increase of:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
methane and nitrous oxide in atmosphere
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B)
methane and \[C{{O}_{2}}\] in atmosphere
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C)
methane and \[{{O}_{3}}\] in atmosphere
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D)
methane and CO in atmosphere
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question_answer19) Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases \[{{H}_{2}}{{O}_{2}}\]acts as a reducing agent in acid medium?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[MnO_{4}^{-}\]
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B)
\[C{{r}_{2}}O_{7}^{2-}\]
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C)
\[SO_{3}^{2-}\]
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D)
KI
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question_answer20) Which one of the following complexes will most likely absorb visible light? (At nos. Sc = 21, Ti = 22, V = 23, Zn = 30)
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[{{[Sc{{({{H}_{2}}O)}_{6}}]}^{3+}}\]
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B)
\[{{[Ti{{(N{{H}_{3}})}_{6}}]}^{4+}}\]
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C)
\[{{[V{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
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D)
\[{{[Zn{{(N{{H}_{3}})}_{6}}]}^{2+}}\]
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question_answer21)
on mercuration-demercuration produces the major product:
[JEE Main Online Paper ( Held On 12 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_answer22) In the Victor-Meyer's test, the colour given by \[1{}^\circ ,\text{ }2{}^\circ \text{ }and\text{ }3{}^\circ \] alcohols are respectively:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
Red, colourless, blue
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B)
Red, blue, colourless
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C)
Colourless, red, blue
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D)
Red, blue, violet
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question_answer23) Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
Claisen
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B)
Friedel-craft
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C)
Sandmeyer
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D)
Wurtz
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question_answer24) In the presence of peroxide, HCl and HI do not give anti- Markownikoff's addition of alkenes because:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
One of the steps is endothermic in HCl and HI
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B)
Both HCl and HI are strong acids
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C)
HCl is oxidizing and the HI is reducing
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D)
All the steps are exothermic is HCl and HI
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question_answer25) The major product obtained in the photo catalyzed bromination of 2--methylbutane is:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
1-bromo-2-methylbutane
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B)
1-bromo-3-methylbutane
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C)
2-bromo-3-methylbutane
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D)
2-bromo-2-methylbutane
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question_answer26) Which of the following molecules has two sigma (s) and two \[{{p}_{i}}(\pi )\]bonds?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
\[{{C}_{2}}{{H}_{4}}\]
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B)
\[{{N}_{2}}{{F}_{2}}\]
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C)
\[{{C}_{2}}{{H}_{2}}C{{l}_{2}}\]
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D)
HCN
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question_answer27) Which one of the following acids does not exhibit optical isomerism?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
Lactic acid
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B)
Tartaric acid
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C)
Maleic acid
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D)
\[\text{ }\!\!\alpha\!\!\text{ -}\]amino acids
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question_answer28) Aminoglycosides are usually used as:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
antibiotic
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B)
analgesic
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C)
hypnotic
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D)
antifertility
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question_answer29) Which of the following will not show mutarotation?
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
Maltose
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B)
Lactose
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C)
Glucose
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D)
Sucrose
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question_answer30) Phthalic acid reacts with resorcinol in the presence of concentrated \[{{H}_{2}}S{{O}_{4}}\]to give:
[JEE Main Online Paper ( Held On 12 Apirl 2014 )
A)
Phenolphthalein
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B)
Alizarin
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C)
Coumarin
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D)
Fluorescein
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