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question_answer1)
Given: 
X is:
JEE Main Online Paper (Held On 09 April 2013)
A)
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B)
done
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C)
done
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D)
done
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question_answer2) Given: \[\operatorname{X}\operatorname{N}{{\operatorname{a}}_{2}}{{\operatorname{HAsO}}_{3}}+\operatorname{Y}{{\operatorname{NaBrO}}_{3}}+\operatorname{ZHCI}\to \operatorname{NaBr}\]\[\text{+}{{\text{H}}_{\text{2}}}\text{As}{{\text{O}}_{\text{4}}}\text{+NaCl}\] The values of X, Y and Z in above reaction are respectively:
JEE Main Online Paper (Held On 09 April 2013)
A)
2, 1, 2
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B)
2, 1, 3
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C)
3, 1, 6
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D)
3, 1, 4
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question_answer3) The migration of dispersion medium under the influence of an electric potential is called:
JEE Main Online Paper (Held On 09 April 2013)
A)
Catachresis
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B)
Electro osmosis
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C)
Electrophoresis
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D)
Sedimentation
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question_answer4) The addition of HI in the presence of peroxide catalyst does not follow anti-Markovnikov?s rule because:
JEE Main Online Paper (Held On 09 April 2013)
A)
HI is a strong reducing agent
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B)
H-I bond is too strong to be broken homiletically
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C)
I atom combines with H atom to back HI
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D)
Iodine atom is not reactive enough to add across a double bond
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question_answer5) In reaction\[\operatorname{A}+2B\rightleftharpoons 2C+\operatorname{D},\] initial concentration of B was 1.5 tunes of \[\left[ \operatorname{A} \right],\]but at equilibrium the concentrations of A and B became equal. The equilibrium constant for the reaction is:
JEE Main Online Paper (Held On 09 April 2013)
A)
8
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B)
4
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C)
12
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D)
6
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question_answer6) Trigonal bipyramidal geometry is shown by:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[\operatorname{X}e{{\operatorname{OF}}_{2}}\]
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B)
\[\operatorname{X}e{{\operatorname{O}}_{3}}{{F}_{2}}\]
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C)
\[\operatorname{F}\operatorname{X}e\operatorname{O}{{\operatorname{SO}}_{2}}\operatorname{F}\]
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D)
\[{{\left[ \operatorname{X}\operatorname{e}{{\operatorname{F}}_{8}} \right]}^{2-}}\]
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question_answer7) If a polythene sample contains two monodisperse fractions in the ration 2: 3 with degree of polymerization 100 and 200, respectively, then its weight average molecular weight will be :
JEE Main Online Paper (Held On 09 April 2013)
A)
4900
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B)
4600
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C)
4300
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D)
5200
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question_answer8) The instantaneous rate of disappearance of\[{{\operatorname{MnO}}_{4}}^{-}\operatorname{ion}\] in the following reaction is \[4.56\times {{10}^{-3}}\operatorname{M}{{\operatorname{s}}^{-1}}\]
\[2{{\operatorname{MnO}}_{4}}^{-}+10{{\operatorname{I}}^{-}}+16{{H }^{+}}\to 2{{\operatorname{Mn}}^{2}}^{+}+\]
\[5\operatorname{I}+8{{H }_{2}}\operatorname{O}\]
The rate of appearance \[{{\operatorname{I}}_{2}}\] is :
JEE Main Online Paper (Held On 09 April 2013)
A)
\[4.56\times {{10}^{-4}}\operatorname{M}{{\operatorname{s}}^{-1}}\]
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B)
\[1.14\times {{10}^{-2}}\operatorname{M}{{\operatorname{s}}^{-1}}\]
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C)
\[1.14\times {{10}^{-3}}\operatorname{M}{{\operatorname{s}}^{-1}}\]
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D)
\[5.7\times {{10}^{-3}}\operatorname{M}{{\operatorname{s}}^{-1}}\]
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question_answer9) Which one of the following is most stable?
JEE Main Online Paper (Held On 09 April 2013)
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_answer10) In an atom how many orbital (s) will have the quantum numbers: n=3, \[l=2\]and\[{{m}_{l}}=+2?\]
JEE Main Online Paper (Held On 09 April 2013)
A)
5
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B)
3
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C)
1
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D)
7
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question_answer11) Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[{{\operatorname{CrO}}_{3}}\]
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B)
\[\operatorname{Cr}{{\operatorname{CI}}_{3}}\]
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C)
\[\operatorname{Cr}{{\operatorname{O}}_{3}}{{\operatorname{CI}}_{2}}\]
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D)
\[{{\operatorname{Cr}}_{2}}{{\operatorname{O}}_{3}}\]
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question_answer12) Rate of dehydration of alcohols follows the order:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[{{2}^{0}}>{{1}^{0}}>{{\operatorname{CH}}_{3}}\operatorname{OH}>{{3}^{0}}\]
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B)
\[{{3}^{0}}>{{2}^{0}}>{{1}^{0}}{{\operatorname{CH}}_{3}}\operatorname{OH}\]
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C)
\[{{2}^{0}}>{{3}^{0}}>{{1}^{0}}{{\operatorname{CH}}_{3}}\operatorname{OH}\]
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D)
\[{{\operatorname{CH}}_{3}}\operatorname{OH}>{{1}^{0}}>{{2}^{0}}>{{3}^{0}}\]
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question_answer13) Given (A) \[{{\operatorname{H}}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{\operatorname{H}}_{2}}O(l):\] \[\Delta {{\operatorname{H}}^{0}}_{298K}=-285.9\operatorname{k}\operatorname{J}\operatorname{m}\operatorname{o}{{1}^{-1}}\] (B)\[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{H}_{2}}O(g);\] \[\Delta {{H}^{0}}_{298K}=-241.8\operatorname{k}\operatorname{j}\operatorname{mo}{{1}^{-1}}\] The molar enthalpy of vaporization of water will be:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[241.8\,\,kJ\,\,mo{{l}^{-1}}\]
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B)
\[22.0\,\,kJ\,\,mo{{l}^{-1}}\]
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C)
\[44.1\,\,kJ\,\,mo{{l}^{-1}}\]
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D)
\[527.7\,\,kJ\,\,mo{{l}^{-1}}\]
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question_answer14) Calcination is the process in which:
JEE Main Online Paper (Held On 09 April 2013)
A)
ore is heated above its melting point to expel \[{{H}_{2}}O\] or \[C{{O}_{2}}\] or \[S{{O}_{2}}\]
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B)
ore is heated below its melting point to expel volatile impurities
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C)
ore is heated above its melting point to removes S, As and Sb as \[S{{O}_{2}},A{{s}_{2}}{{O}_{3}}\] and\[S{{b}_{2}}{{O}_{3}}\] respectively
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D)
ore is heated below its melting point to expel \[{{H}_{2}}O\]or\[C{{O}_{2}}\]
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question_answer15) Sodium Carbonate cannot be used in place of \[{{({{\operatorname{NH}}_{4}})}_{2}}{{\operatorname{CO}}_{3}}\] for the identification of \[C{{a}^{2+}},B{{a}^{2+}}\] and \[\operatorname{S}{{r}^{2+}}\] ions (in group V) during mixture analysis because:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[M{{g}^{2+}}\]ions will also be precipitated
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B)
Concentration of \[CO_{3}^{2-}\] ions is very low
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C)
Sodium ions will acid radicals
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D)
\[{{\operatorname{Na}}^{+}}\] ions will interfere with the detection of \[C{{a}^{2+}},\operatorname{B}{{a}^{2+}},{{\operatorname{Sr}}^{2+}}\] ions
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question_answer16) Which one of the following molecules is polar?
JEE Main Online Paper (Held On 09 April 2013)
A)
\[\operatorname{Xe}{{\operatorname{F}}_{4}}\]
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B)
\[{{\operatorname{IF}}_{5}}\]
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C)
\[\operatorname{Sb}{{\operatorname{F}}_{5}}\]
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D)
\[\operatorname{C}{{\operatorname{F}}_{4}}\]
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question_answer17) Type of isomerism which exists between \[\left[ \operatorname{Pd}{{\left( {{\operatorname{C}}_{6}}{{\operatorname{H}}_{5}} \right)}_{2}}{{\left( \operatorname{SCN} \right)}_{2}} \right]\]and \[\left[ \operatorname{Pd}{{\left( {{\operatorname{C}}_{6}}{{\operatorname{H}}_{5}} \right)}_{2}}{{\left( \operatorname{NCS} \right)}_{2}} \right]\] is
JEE Main Online Paper (Held On 09 April 2013)
A)
Linkage isomerism
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B)
Coordination isomerism
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C)
lionization isomerism
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D)
Solvate isomerism
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question_answer18) In which of the following ionization processes the bond energy has increased and also the magnetic behaviour has changed from paramagnetic to diamagnetic?
JEE Main Online Paper (Held On 09 April 2013)
A)
\[ N\operatorname{O}\to {{\operatorname{NO}}^{+}}\]
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B)
\[{{N }_{2}}\to {{\operatorname{N}}_{2}}^{+}\]
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C)
\[{{C}_{2}}\to {{C}_{2}}^{+}\]
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D)
\[{{O}_{2}}\to {{O}_{2}}^{+}\]
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question_answer19) 12g of a nonvolatile solute dissolved in 108g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the lute is:
A)
80
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B)
60
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C)
20
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D)
40
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question_answer20) Which of the following enzyme converts starch into maltose?
JEE Main Online Paper (Held On 09 April 2013)
A)
Diastase
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B)
Maltase
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C)
Zymase
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D)
Invertase
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question_answer21) Electrode potentials \[\left( {{E}^{0}} \right)\] are given below: \[{{\operatorname{Cu}}^{+}}+\operatorname{Cu}=+0.52V,\] \[F{{e}^{3+}}/F{{e}^{2+}}=+0.77V,\] \[\frac{1}{2}{{\operatorname{I}}_{2}}\left( s \right)/{{I}^{-}}=+0.54V,\] \[A{{g}^{+}}/Ag=+0.88V.\] Based on the above potentials, strongest oxidizing agent will be:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[{{\operatorname{Cu}}^{+}}\]
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B)
\[{{\operatorname{Fe}}^{3}}^{+}\]
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C)
\[{{\operatorname{Ag}}^{+}}\]
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D)
\[{{\operatorname{I}}_{2}}\]
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question_answer22) Aryl fluoride may be prepared from arene diazonium chloride using:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[{{\operatorname{HBF}}_{4}}/\Delta \]
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B)
\[{{\operatorname{HBF}}_{4}}/\operatorname{N}a\operatorname{N}{{\operatorname{O}}_{2}},\operatorname{Cu},\Delta \]
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C)
\[\operatorname{Cu}\operatorname{F}/\operatorname{H}\operatorname{F}\]
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D)
\[\operatorname{Cu}/\operatorname{H}\operatorname{F}\]
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question_answer23) Anether (A) \[{{\operatorname{C}}_{5}}{{\operatorname{H}}_{12}}\operatorname{O},\]when heated with excess of hot concentrated HI produced two alky halides which when treated with NaOH yielded compounds (B) and (C) Oxidation of (B) and (C) gave a propanone and an ethanoic acid respectively. The IUPAC name of the ether (A) is:
JEE Main Online Paper (Held On 09 April 2013)
A)
2-ethoxypropane
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B)
ethoxypropane
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C)
methoxybutane
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D)
2-methoxybutane
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question_answer24) Electron gain enthalpy with negative sing of fluorine is less than that of chlorine due to:
JEE Main Online Paper (Held On 09 April 2013)
A)
High ionization enthalpy of fluorine
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B)
Smaller size of chlorine atom
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C)
Smaller size of fluorine atom
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D)
Bigger size of \[2p\]orbital of fluorine
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question_answer25) Solid \[Ba{{(N{{O}_{3}})}_{2}}\] is gradually dissolved in a \[1.0\times {{10}^{-4}}\,M\,N{{a}_{2}}C{{O}_{3}}\] solution. At which concentration of \[B{{a}^{2+}}\], precipitate of \[BaC{{O}_{3}}\]begins to form? \[({{K}_{sp}}\] for \[BaC{{O}_{3}}=5.1\times {{10}^{-9}})\]
JEE Main Online Paper (Held On 09 April 2013)
A)
\[5.1\times {{10}^{-5}}\operatorname{M}\]
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B)
\[7.1\times {{10}^{-8}}\operatorname{M}\]
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C)
\[4.1\times {{10}^{-5}}\operatorname{M}\]
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D)
\[8.1\times {{10}^{-7}}\operatorname{M}\]
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question_answer26) An element having an atomic radius of 0.14 nm crystallizes in a fcc unit cell. What is the length of a side of the cell?
JEE Main Online Paper (Held On 09 April 2013)
A)
0.56 nm
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B)
0.24 nm
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C)
0.96 nm
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D)
0.4 nm
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question_answer27) Which of the following compounds is not expected to show Lassaignes? test for nitrogen?
JEE Main Online Paper (Held On 09 April 2013)
A)
Propanenitrile
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B)
Hydroxylamie hydrochloride
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C)
Niromethane
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D)
Ethanmine
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question_answer28) Formaldehyde can be distinguished from acetaldehyde the use of:
JEE Main Online Paper (Held On 09 April 2013)
A)
Schiff's reagent
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B)
Tollen's reagent
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C)
\[{{\operatorname{I}}_{2}}/\]Alkali
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D)
Fehling's solution
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question_answer29) By how many folds the temperature of a gas would increase when the root mean square velocity of the gas molecules in a container of fixed volume is increased from \[5\times {{10}^{4}}\operatorname{cm}/s\] to\[10\times {{10}^{4}}\] cm/s?
JEE Main Online Paper (Held On 09 April 2013)
A)
Two
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B)
Three
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C)
Six
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D)
Four
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question_answer30) The element which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds:
JEE Main Online Paper (Held On 09 April 2013)
A)
\[3{{\operatorname{d}}^{5}}4{{\operatorname{s}}^{2}}\]
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B)
\[3{{\operatorname{d}}^{8}}4{{\operatorname{s}}^{2}}\]
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C)
\[3{{\operatorname{d}}^{7}}4{{\operatorname{s}}^{2}}\]
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D)
\[3{{\operatorname{d}}^{6}}4{{\operatorname{s}}^{2}}\]
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