done
clear
C)
\[~{{N}^{3+}}\]
done
clear
D)
\[C{{u}^{+}}\]
done
clear
View Answer play_arrow
question_answer6) The uncertainty in momentum of an electron is\[1\times {{10}^{-5}}\,m/s\]. The uncertainty in its position will be \[(h=6.62\times {{10}^{-34}}\,kg\,{{m}^{2}}/s)\]: [AIPMT 1999]
A)
\[1.05\times {{10}^{-28}}\,m\]
done
clear
B)
\[1.05\times {{10}^{-26}}\,m\]
done
clear
C)
\[5.27\times {{10}^{-30}}\,m\]
done
clear
D)
\[5.25\times {{10}^{-28}}\,m\]
done
clear
View Answer play_arrow
question_answer7) Who modified Bohr's theory by introducing elliptical orbits for electron path? [AIPMT 1999]
A)
Hund
done
clear
B)
Thomson
done
clear
C)
Rutherford
done
clear
D)
Sommerfeld
done
clear
View Answer play_arrow
question_answer8) The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is: [AIPMT 1999]
A)
\[6.63\times {{10}^{-33}}\,m\]
A)
1
done
clear
B)
2
done
clear
C)
3
done
clear
D)
4
done
clear
View Answer play_arrow
question_answer12) In hydrogen atom, energy of first excited state is -3.4 eV. Then KE of same orbit of hydrogen atom: [AIPMT 2002]
A)
+ 3.4 eV
done
clear
B)
+ 6.8 eV
done
clear
C)
13.6 eV
done
clear
D)
+ 13.6 eV
done
clear
View Answer play_arrow
question_answer13) General electronic configuration of lanthanides are: [AIPMT 2002]
A)
\[(n-2){{f}^{1-14}}(n-1){{s}^{2}}{{p}^{6}}{{d}^{0-1}}n{{s}^{2}}\]
done
clear
B)
\[(n-2){{f}^{10-14}}(n-1){{d}^{0-1}}n{{s}^{2}}\]
done
clear
C)
\[(n-2){{f}^{0-14}}(n-1){{d}^{10}}n{{s}^{2}}\]
done
clear
D)
\[(n-2){{d}^{0-1}}(n-1){{f}^{1-14}}n{{s}^{2}}\]
done
clear
View Answer play_arrow
question_answer14) Which of the following is iso-electronic? [AIPMT 2002]
A)
\[C{{O}_{2}},\text{ }N{{O}_{2}}\]
done
clear
B)
\[NO_{2}^{-},\,C{{O}_{2}}\]
done
clear
C)
\[C{{N}^{-}},\text{ }CO\]
done
clear
D)
\[S{{O}_{2}},\,C{{O}_{2}}\]
done
clear
View Answer play_arrow
question_answer15) The value of Planck's constant is \[6.63\times {{10}^{-34}}Js\]. The velocity of light is \[3.0\times {{10}^{8}}m{{s}^{-1}}\]. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of \[8\times {{10}^{15}}{{s}^{-1}}\]? [AIPMT 2003]
A)
\[4\times {{10}^{1}}\]
done
clear
B)
\[3\times {{10}^{7}}\]
done
clear
C)
\[2\times {{10}^{-25}}\]
done
clear
D)
\[5\times {{10}^{-18}}\]
done
clear
View Answer play_arrow
question_answer16) The frequency of radiation emitted when the electron falls from \[n=4\] to \[n=1\] in a hydrogen atom will be (Given ionisation energy of \[H=2.18\,\,{{10}^{-18}}J\,ato{{m}^{-1}}\] and \[h=6.625\times {{10}^{-34}}Js):\] [AIPMT (S) 2004]
A)
\[1.54\times l{{0}^{15}}\text{ }{{s}^{-1}}\]
done
clear
B)
\[1.03\times {{10}^{15}}\,\,{{s}^{-1}}\]
done
clear
C)
\[3.08\times {{10}^{15}}\text{ }{{s}^{-1}}\]
done
clear
D)
\[2.00\times {{10}^{15}}\text{ }{{s}^{-1}}\]
done
clear
View Answer play_arrow
question_answer17) The energy of second Bohr orbit of the hydrogen atom is \[\text{ }328\text{ }kJ\text{ }mo{{l}^{-1}};\] hence the energy of fourth Bohr orbit would be: [AIPMT (S) 2005]
A)
\[-\,41\text{ }kJ\text{ }mo{{l}^{-1}}\]
done
clear
B)
\[-\,1312\text{ }kJ\text{ }mo{{l}^{-1}}\]
done
clear
C)
\[-\,164\text{ }kJ\text{ }mo{{l}^{-1}}\]
done
clear
D)
\[-\,82\text{ }kJ\text{ }mo{{l}^{-1}}\]
done
clear
View Answer play_arrow
question_answer18) Given: The mass of electron is \[9.11\times {{10}^{-31}}kg\] Planck constant is \[6.626\times {{10}^{-34}}Js\], the uncertainty involved in the measurement of velocity within a distance of \[0.1\,\,\overset{o}{\mathop{A}}\,\] is : [AIPMT (S) 2006]
A)
\[5.79\times {{10}^{6}}m{{s}^{-1}}\]
done
clear
B)
\[5.79\times {{10}^{{}}}m{{s}^{-1}}\]
done
clear
C)
\[5.79\times {{10}^{8}}m{{s}^{-1}}\]
done
clear
D)
\[5.79\times {{10}^{5}}m{{s}^{-1}}\]
done
clear
View Answer play_arrow
question_answer19) The orientation of an atomic orbital is governed by: [AIPMT (S) 2006]
A)
azimuthal quantum number
done
clear
B)
spin quantum number
done
clear
C)
magnetic quantum number
done
clear
D)
principal quantum number
done
clear
View Answer play_arrow
question_answer20)
A)
ii, iii and iv
done
clear
B)
i, ii, iii and iv
done
clear
C)
ii, iv and v
done
clear
D)
i and iii
done
clear
View Answer play_arrow
question_answer21) If uncertainty in position and momentum are equal, then uncertainty in velocity is [AIPMT (S) 2008]
A)
\[\frac{1}{2m}\sqrt{\frac{h}{\pi }}\]
done
clear
B)
\[\sqrt{\frac{h}{2\pi }}\]
done
clear
C)
\[\frac{1}{m}\sqrt{\frac{h}{\pi }}\]
done
clear
D)
\[\sqrt{\frac{h}{\pi }}\]
done
clear
View Answer play_arrow
question_answer22) The measurement of the electron position is associated with an uncertainty in momentum, which is equal to \[1\times {{10}^{-18}}g\,cm\,{{s}^{-1}}\]. The uncertainty in electron velocity is, (mass of an electron is \[9\times {{10}^{-28}}g\]) [AIPMT (S) 2008]
A)
\[1\times {{10}^{9}}cm\,{{s}^{-1}}\]
done
clear
B)
\[1\times {{10}^{6}}cm\,{{s}^{-1}}\]
done
clear
C)
\[1\times {{10}^{5}}cm\,{{s}^{-1}}\]
done
clear
D)
\[1\times {{10}^{11}}cm\,{{s}^{-1}}\]
done
clear
View Answer play_arrow
question_answer23) Maximum number of electrons in a subshell of, an atom is determined by the following [AIPMT (S) 2009]
A)
\[4\,l+2\]
done
clear
B)
\[2\,l+1\]
done
clear
C)
\[4\,l-2\]
done
clear
D)
\[2\,{{n}^{2}}\]
done
clear
View Answer play_arrow
question_answer24) Which of the following is not permissible arrangement of electrons in an atom? [AIPMT (S) 2009]
A)
\[n=4,\,l=0,\,m=0,\,s=-1/2\]
done
clear
B)
\[n=5,\,l=3,\,m=0,\,s=+1/2\]
done
clear
C)
\[n=3,\,l=2,\,m=-3,\,s=-1/2\]
done
clear
D)
\[n=3,\,l=2,\,m=-2,\,s=-1/2\]
done
clear
View Answer play_arrow
question_answer25)
A)
\[N{{i}^{3+}}\]
done
clear
B)
\[M{{n}^{3+}}\]
done
clear
C)
\[F{{e}^{3+}}\]
done
clear
D)
\[C{{o}^{3+}}\]
done
clear
View Answer play_arrow
question_answer26) A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be\[(h=6.6\times {{10}^{-34}}Js)\] [AIPMT (M) 2010]
A)
\[6.6\times {{10}^{-32}}m\]
done
clear
B)
\[6.6\times {{10}^{-34}}m\]
done
clear
C)
\[1.0\times {{10}^{-35}}m\]
done
clear
D)
\[1.0\times {{10}^{-32}}m\]
done
clear
View Answer play_arrow
question_answer27) The total number of atomic orbitals in fourth energy level of an atom is [AIPMT (S) 2011]
A)
16
done
clear
B)
32
done
clear
C)
4
done
clear
D)
8
done
clear
View Answer play_arrow
question_answer28) The energies \[{{E}_{1}}\] and \[{{E}_{2}}\] of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\]will be [AIPMT (S) 2011]
A)
\[{{\lambda }_{1}}=2{{\lambda }_{2}}\]
done
clear
B)
\[{{\lambda }_{1}}=4{{\lambda }_{2}}\]
done
clear
C)
\[{{\lambda }_{1}}=\frac{1}{2}{{\lambda }_{2}}\]
done
clear
D)
\[{{\lambda }_{1}}={{\lambda }_{2}}\]
done
clear
View Answer play_arrow
question_answer29) If \[n=6,\] the correct sequence for filling of electrons will be [AIPMT (S) 2011]
A)
\[ns\xrightarrow[{}]{{}}(n-1)d\xrightarrow[{}]{{}}(n-2)f\xrightarrow[{}]{{}}np\]
done
clear
B)
\[ns-(n-2)f\xrightarrow[{}]{{}}np\xrightarrow[{}]{{}}(n-1)d\]
done
clear
C)
\[ns-np\xrightarrow[{}]{{}}(n-1)d\xrightarrow[{}]{{}}(n-2)f\]
done
clear
D)
\[ns\xrightarrow[{}]{{}}(n-2)f\xrightarrow[{}]{{}}(n-1)d\xrightarrow[{}]{{}}np\]
done
clear
View Answer play_arrow
question_answer30) According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon? [AIPMT (M) 2011]
A)
\[n=6\] to \[n=1\]
done
clear
B)
\[n=5\] to \[n=4\]
done
clear
C)
\[n=6\] to \[n=5\]
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