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Class 11
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Chemistry
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Structure of Atom
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Hard Questions
Structure Of Atom
Chemistry
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Naturally occurring B consists of two isotopes, whose atomic weights are 10.01 and 11.01. The atomic weight of natural boron is 10.81. The % of each isotope in natural boron is :
A
% of isotope of mass 10.01 = 20, % of isotope of mass 11.01 = 80
B
% of isotope of mass 10.01 = 30, % of isotope of mass 11.01 = 70
C
% of isotope of mass 10.01 = 50, % of isotope of mass 11.01 = 50
D
none of these
Hard
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According to Bohr's theory of hydrogen-atom, for the electron in the
$n_{th}$
permissible orbit
A
$Linear Momentum∝n1 $
B
$Radius of orbit∝n$
C
$Kinetic Energy∝n_{2}1 $
D
$Angular Momentum∝n$
Hard
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The energy of separation of an electron is
$30.6eV$
moving in an orbit of
$Li_{2+}$
. The number of waves made by the electron in one complete revolution in the orbit is:
Hard
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If the principle quantum number n = 6, the correct sequence of filling of electron will be :
A
$ns→$
$(n−2)f$
$→$
np
$→(n−1)$
B
$ns→$
$(n−1)f$
$→$
$np$
$→(n−2)$
C
$ns→np→(n−1)d→(n−2)f$
D
$ns→(n−2)f→(n−1)d→np$
Hard
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The orbital diagram in which aufbau principle is violated is:
A
B
C
D
Hard
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What principle is violated here?
A
Laws of Motion
B
Energy conservation
C
Nothing is violated
D
Cannot be decided
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In Bohr's model of an atom :
A
Electrons revolve around the nucleus in circular orbits.
B
These circular orbits or shells are stationary.
C
Each shell in associated with a definite amount of energy.
D
All shells have equal energy level.
Hard
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Maximum number of electrons in a subshell of an atom is determined by the following:
A
$2l+2$
B
$4l-1$
C
$2n_{2}$
D
$4l + 2$
Hard
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Which one of the following equations representing various nuclear processes can be balanced by filling in the blank with one alpha-particle?
A
$_{92}U_{238}+_{0}N_{1}⟶_{93}Np_{239}+__________$
B
$_{7}N_{14}+_{0}n_{1}⟶_{6}C_{14}+_________$
C
$_{38}Sr_{90}⟶_{39}Y_{90}+________$
D
$_{92}U_{238}⟶_{90}Th_{234}+__________$
Hard
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For the hydrogen atom, the energy of the electron is defined by the factor
$E_{n}=−13.58/n_{2}eV$
. Here n is positive integer. The minimum quantity of energy which it can absorb in its primitive stage is:
A
$1.00eV$
B
$3.39eV$
C
$6.79eV$
D
$10.19eV$
Hard
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