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question_answer1) Among the following, the molecule with the lowest dipole moment is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[CHC{{l}_{3}}\]
done
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B)
\[C{{H}_{3}}Cl\]
done
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C)
\[C{{H}_{2}}C{{l}_{2}}\]
done
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D)
\[CC{{l}_{4}}\]
done
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question_answer2) If\[{{K}_{sp}}\]of\[Ca{{F}_{2}}\]at \[={{25}^{o}}C\]is\[1.7\times {{10}^{-10}},\]the combination amongst the following which gives a precipitate of \[Ca{{F}_{2}}\] is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[1\times {{10}^{-2}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-3}}M\,{{F}^{-}}\]
done
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B)
\[1\times {{10}^{-4}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-4}}M\,{{F}^{-}}\]
done
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C)
\[1\times {{10}^{-2}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-5}}M\,{{F}^{-}}\]
done
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D)
\[1\times {{10}^{-3}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-5}}M\,{{F}^{-}}\]
done
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question_answer3) The correct order of ligands in the spectro chemical series is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[C{{l}^{-}}>en>C{{N}^{-}}>NC{{S}^{-}}\]
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B)
\[C{{l}^{-}}>en>NC{{S}^{-}}>C{{l}^{-}}\]
done
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C)
\[NC{{S}^{-}}>C{{N}^{-}}>C{{l}^{-}}>en\]
done
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D)
\[en>C{{N}^{-}}>C{{l}^{-}}>NC{{S}^{-}}\]
done
clear
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question_answer4) The value of\[{{K}_{p}}\]for the equilibrium reaction\[{{N}_{2}}{{O}_{4}}(g)2N{{O}_{2}}(g)\]is 2. The percentage dissociation of \[{{N}_{2}}{{O}_{4}}(g)\]at a pressure of 0.5 atm is
JEE Main Online Paper (Held On 19 May 2012)
A)
25
done
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B)
88
done
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C)
50
done
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D)
71
done
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question_answer5)
The order of basicity of the compounds is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[IV>I>III>II\]
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B)
\[I>III>II>IV\]
done
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C)
\[III>I>IV>II\]
done
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D)
\[II>I>III>IV\]
done
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question_answer6) Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is 180 pm, the size of ammonium ion would be
JEE Main Online Paper (Held On 19 May 2012)
A)
174pm
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B)
158pm
done
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C)
142pm
done
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D)
126pm
done
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question_answer7) Which pair of elements with the given atomic numbers is expected to have similar properties?
JEE Main Online Paper (Held On 19 May 2012)
A)
40,72
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B)
20,36
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C)
10,28
done
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D)
11,12
done
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question_answer8) Extraction of zinc from zinc blende is achieved By
JEE Main Online Paper (Held On 19 May 2012)
A)
roasting followed by self-reduction
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B)
electrolytic reduction
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C)
roasting followed by reduction with carbon
done
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D)
roasting followed by reduction with another metal
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question_answer9) Liquids A and B form an ideal solution. At \[30{}^\circ C\], the total vapour pressure of a Solution containing 1 mol of A and 2 mol of B is 250 mm Hg. The total vapour pressure becomes 300 mm Hg when 1 more mol of A is added to the first solution. The vapour pressures of pure A and B at the same temperature are
JEE Main Online Paper (Held On 19 May 2012)
A)
150,450 mm Hg
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B)
125,150 mm Hg
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C)
450,150 mm Hg
done
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D)
250,300 mm Hg
done
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question_answer10)
The IUPAC name of the following compound is
JEE Main Online Paper (Held On 19 May 2012)
A)
(E)-2-hepten-4-yne
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B)
Z)-5-hepten-3-yne
done
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C)
(E)-5-hepten-3-yne
done
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D)
(Z)-2-hepten-4-yne
done
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question_answer11) Which of the following paramagnetic ions would exhibit a magnetic moment (spin only) of the order of 5 BM? (At. Nos. \[Mn=25,Cr=24,V=23,Ti=22\])
JEE Main Online Paper (Held On 19 May 2012)
A)
\[M{{n}^{2+}}\]
done
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B)
\[T{{i}^{2+}}\]
done
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C)
\[{{V}^{2+}}\]
done
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D)
\[C{{r}^{2+}}\]
done
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question_answer12) Which one of the following will react most vigorously with water?
JEE Main Online Paper (Held On 19 May 2012)
A)
Li
done
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B)
K
done
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C)
Rb
done
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D)
Na
done
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question_answer13) Which of the following has the square planar structure?
JEE Main Online Paper (Held On 19 May 2012)
A)
\[Xe{{F}_{4}}\]
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B)
\[NH_{4}^{+}\]
done
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C)
\[BF_{4}^{-}\]
done
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D)
\[CC{{l}_{4}}\]
done
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question_answer14) The major product obtained in the photobromination of 2-methyl butane is
JEE Main Online Paper (Held On 19 May 2012)
A)
2-bromo-2-methylbutane
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B)
1-bromo-2-methylbutane
done
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C)
1-bromo-3-methylbutane
done
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D)
2-bromo-3-methylbutane
done
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question_answer15) If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become
JEE Main Online Paper (Held On 19 May 2012)
A)
one fourth
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B)
half
done
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C)
four times
done
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D)
two times
done
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question_answer16) When \[C{{O}_{2(g)}}\]is passed over red hot coke it partially gets reduced to \[CO(g).\]Upon passing L of \[C{{O}_{2}}(g)\] over red hot coke, the total volume of the gases increased to 700 mL. The composition of the gaseous mixture at STP is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[C{{O}_{2}}=300mL;CO=400mL\]
done
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B)
\[C{{O}_{2}}=0.0mL;CO=700mL\]
done
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C)
\[C{{O}_{2}}=200mL;CO=500mL\]
done
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D)
\[C{{O}_{2}}=350mL;CO=350mL\]
done
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question_answer17)
For a reaction \[A\to \]Products, a plot of \[\log {{t}_{1/2}}\] versus \[\log {{a}_{0}}\]is shown in the figure. If the initial concentration of A is represented by \[{{a}_{0}}\] the order of the reaction is
JEE Main Online Paper (Held On 19 May 2012)
A)
one
done
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B)
zero
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C)
two
done
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D)
three
done
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question_answer18) An open vessel at 300 K is heated till 2/5th of the air in it is expelled. Assuming that the volume of the vessel remains constant, the temperature to which the vessel is heated, is
JEE Main Online Paper (Held On 19 May 2012)
A)
1500 K
done
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B)
400 K
done
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C)
500 K
done
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D)
750 K
done
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question_answer19) Which of the following is a polyamide?
JEE Main Online Paper (Held On 19 May 2012)
A)
Teflon
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B)
Orion
done
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C)
Nylon
done
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D)
Terylene
done
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question_answer20) The compound of xenon with zero dipole moment is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[Xe{{O}_{3}}\]
done
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B)
\[Xe{{F}_{4}}\]
done
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C)
\[XeO{{F}_{4}}\]
done
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D)
\[Xe{{O}_{2}}\]
done
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question_answer21) The standard potentials of\[A{{g}^{+}}/Ag,H{{g}_{2}}^{2+}/2Hg,\]\[C{{u}^{2+}}/Cu\] and \[M{{g}^{2+}}/Mg\] electrodes are 0.80,0.79, 0.34 and -2.37 V, respectively. An aqueous solution which contains one mole per litre of the salts of each of the four metals is electrolyzed. With increasing voltage, the correct sequence of deposition of the metals at the cathode is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[Ag,Hg,Cu,Mg\]
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B)
\[Cu,Hg,Ag\]only
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C)
\[Ag,Hg,Cu\]only
done
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D)
\[Mg,Cu,Hg,Ag\]
done
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question_answer22) The product of the reaction between ethyl benzene and N-bromosuccinamide is
JEE Main Online Paper (Held On 19 May 2012)
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) On addition of 1 mL of 10% NaCl solution to 10 mL gold sol in the presence of 0.025 g of starch, the coagulation is just prevented. Starch has gold number
JEE Main Online Paper (Held On 19 May 2012)
A)
2.5
done
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B)
25
done
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C)
0.25
done
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D)
0.025
done
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question_answer24) Which of the following is a non-reducing sugar?
JEE Main Online Paper (Held On 19 May 2012)
A)
Lactose
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B)
Fructose
done
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C)
Sucrose
done
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D)
Maltose
done
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question_answer25) Fog is a colloidal solution of
JEE Main Online Paper (Held On 19 May 2012)
A)
solid particles dispersed in gas
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B)
solid particles dispersed in a liquid
done
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C)
liquid particles dispersed in gas
done
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D)
gaseous particles dispersed in a liquid
done
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question_answer26) The enthalpy of neutralisation of \[N{{H}_{4}}OH\]with HCl is -51.46 kJ \[\text{mo}{{\text{l}}^{-1}}\] and the enthalpy of neutralisation of NaOH with HCl is -55.90 kJ \[\text{mo}{{\text{l}}^{-1}}\]. The enthalpy of ionisation of\[N{{H}_{4}}OH\] His
JEE Main Online Paper (Held On 19 May 2012)
A)
\[\text{-107}\text{.36}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]
done
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B)
\[\text{-4}\text{.44}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]
done
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C)
\[\text{+107}\text{.36}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]
done
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D)
\[\text{+4}\text{.44}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]
done
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question_answer27) Aspirin can be prepared by the reaction of
JEE Main Online Paper (Held On 19 May 2012)
A)
Salicyldehyde with acetic anhydride in presence of\[{{H}_{2}}S{{O}_{4}}\]
done
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B)
Salicylic acid with metnanol in presence of\[{{H}_{2}}S{{O}_{4}}\]
done
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C)
Salicylic acid with acetic anhydride in presence of \[{{H}_{2}}S{{O}_{4}}\]
done
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D)
Cinnamic acid with acetic anhydride in presence of\[{{H}_{2}}S{{O}_{4}}\]
done
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question_answer28) Beilstein test is used for the estimation of which one of the following elements?
JEE Main Online Paper (Held On 19 May 2012)
A)
S
done
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B)
Cl
done
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C)
C and H
done
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D)
N
done
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question_answer29) Square-planar geometry is shown by
JEE Main Online Paper (Held On 19 May 2012)
A)
\[[PtC{{l}_{2}}{{(N{{H}_{3}})}_{2}}]\]
done
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B)
\[{{[NiC{{l}_{4}}]}^{2-}}\]
done
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C)
\[MnO_{4}^{-}\]
done
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D)
\[CrO_{4}^{2-}\]
done
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question_answer30) Reagent used to convert allyl alcohol to acrole in is
JEE Main Online Paper (Held On 19 May 2012)
A)
\[Mn{{O}_{2}}\]
done
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B)
\[{{H}_{2}}{{O}_{2}}\]
done
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C)
\[Os{{O}_{4}}\]
done
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D)
\[KMn{{O}_{4}}\]
done
clear
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