CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 8 - MCQExams.com

The maximum number of electrons in any shell is given by____ rule.
  • 2n
  • $$n^2$$
  • $$2n^2$$
  • $$4n^2$$
The Ionisation potential of Hydrogen is $$2.17\times 10^{-11}erg/ atom$$. The energy of the electron in the second orbit of the hydrogen atom is?
  • $$-\dfrac {2.17\times 10^{-11}}{2}$$
  • $$-\dfrac {2.17\times 10^{-11}}{2^{2}}$$
  • $$-\dfrac {2.17\times 10^{-7}}{2^{2}}$$
  • $$-\dfrac {2.17\times 10^{11}}{2^{2}}$$
According to the Bohr's atomic model, the relation between principal quantum number (n) and radius of orbit(r) is?
  • $$r\propto n^2$$
  • $$r\propto \displaystyle\frac{1}{n^2}$$
  • $$r\propto \displaystyle \frac{1}{n}$$
  • $$r\propto n$$
What does the electronic configuration $$1{ s }^{ 2 },2{ s }^{ 2 },2{ p }^{ 5 },3{ s }^{ 1 }$$ indicate?
  • Ground state of fluorine
  • Excited state of fluorine
  • Excited state of neon
  • Excited state of the $${ O }_{ 2 }^{ - }$$ ion
In Bohr series of lines of hydrogen spectrum, the third line from the red corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?
  • $$2\rightarrow 5$$
  • $$3\rightarrow 2$$
  • $$5\rightarrow 2$$
  • $$4\rightarrow 1$$
Which of the following electronic configuration is not possible?
  • $$1{ s }^{ 2 }2{ s }^{ 2 }$$
  • $$1{ s }^{ 2 },2{ s }^{ 2 }2{ p }^{ 6 }$$
  • $$\left[ Ar \right] 3{ d }^{ 10 },4{ s }^{ 2 },4{ p }^{ 2 }$$
  • $$1{ s }^{ 2 },2{ s }^{ 2 }2{ p }^{ 2 },3{ s }^{ 1 }$$
The electrons, identified by quantum numbers $$n$$ and $$l$$ (i) $$n=4,l=1$$, (ii) $$n=4,l=0$$  (iii) $$n=3,l=2$$  (iv)  $$n=3,l=1$$ can be place in order of increasing energy, from the lowest to highest, as:
  • (iv)< (ii)< (iii)< (i)
  • (ii)< (iv)< (ii)< (iii)
  • (i)< (iii)< (ii)< (ii)
  • (iii)< (i)< (iv)< (ii)
When a hydrogen atom is raised from the ground state to an excited state.
  • Both K.E. and P.E. increase
  • Both K.E. and P.E. decrease
  • The P.E. decreases and K.E. increases
  • The P.E. increases and K.E. decreases
An electron with kinetic energy E collides with a hydrogen atom in the ground state. The collision will be elastic.
  • for all values of E.
  • for $$E < 10.2$$ eV.
  • for $$10.2$$ eV $$<$$ E $$< 13.6$$ eV only.
  • for $$0 <$$ E $$< 3.4$$ eV only.
The Vividh Bharati station of all india Radio, Delhi,broadcasts on a frequency of 1,368kHz (kilo hertz). Calculate the wavelength of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to ?
  • Visible region
  • Radio wave region
  • Infrared region
  • Microwave region
The ratio of the wavelength of photon corresponding to the $$\alpha-$$line of Lyman series in $$H-$$atom and $$\beta-$$line of Balmer series in $$He^{+}$$ is:
  • $$1 : 1$$
  • $$1 : 2$$
  • $$1 : 4$$
  • $$3 : 16$$
The energy levels for $$_{Z}A^{(+Z - 1)}$$ can be given by:
  • $$E_{n}$$ for $$A^{(+Z - 1)} = Z^{2} \times E_{n}$$ for $$H$$
  • $$E_{n}$$ for $$A^{(+Z - 1)} = Z \times E_{n}$$ for $$H$$
  • $$E_{n}$$ for $$A^{(+Z - 1)} = \dfrac {1}{Z^{2}} \times E_{n}$$ for $$H$$
  • $$E_{n}$$ for $$A^{(+Z - 1)} = \dfrac {1}{Z} \times E_{n}$$ for $$H$$
What is the atomic number of the element with symbol Uus?
  • $$117$$
  • $$116$$
  • $$115$$
  • $$114$$
Which of the following orbitals are nearest to nucleus?
  • 4f
  • 5d
  • 6s
  • 7p
An element with atomic number 117 is known as:
  • nihonium
  • flerovium
  • tennessine
  • roentgenium
Meitnerium is IUPAC official name of an element with atomic number?
  • 113
  • 118
  • 104
  • 109
The matter can not be perceived through our senses.
  • True
  • False
Which of the following statements is correct for an electron having azimuthal quantum number $$l = 2$$?
  • The electron may be in the lowest energy shell
  • The electron is in a spherical orbital
  • The electron must have spin $$m_{s} = + \dfrac {1}{2}$$
  • None
If EAN of a central metal ion $${ X }^{ +2 }$$ in a complex isand atomic number of $$X$$ isThe number of monodentate ligands present in complex are:
  • 3
  • 4
  • 6
  • 2
What is the name and symbol of the element with atomic number 112?
  • Ununbium, Uub
  • Unnilbium, Unb
  • Ununnillum, Uun
  • Ununtrium, Uut
The electron in Bohr's model of hydrogen atom is pictured as revolving around the nucleus in order for it to :
  • emit photons
  • keep from being pulled into the nucleus
  • keep from being repelled by the nucleus
  • possess energy
If the radius of first Bohr orbit is x pm, then the radius of the third orbit would be :
  • $$(3\times x )pm$$
  • $$(6\times x )pm$$
  • $$(\frac{1}{2}\times x )pm$$
  • $$(9\times x )pm$$
The atoms in a molecule do not remain stationary. They vibrate around their mean position, by stretching or bending out of plane. We gain useful knowledge about these vibrations and the energy they carry by studying:
  • $$X-$$ray spectra
  • ultraviolet spectra
  • infrared spectra
  • visible spectra
The radius of a hydrogen atom in the ground state is $$0.53 \mathring {A}$$. What will be the radius of $$Li^{2+}$$ in the ground state?
  • $$1.06\mathring{A}$$
  • $$0.265\mathring{A}$$
  • $$0.17\mathring{A}$$
  • $$0.53\mathring{A}$$
The spectrum of a molecule is so detailed that a molecule can be identified by its spectrum.
  • Only if it is small
  • Only by test-tube analysis
  • With great difficulty
  • Easily, like a fingerprint
If an electron jumps from orbit $$A$$ to orbit $$B$$ it loses energy while when it jumps from $$C$$ to $$B$$ it gains energy. Arrange the orbits in the increasing order of distance from the nucleus.
  • $$A < B < C$$
  • $$C < A < B$$
  • $$C < B < A$$
  • $$A < C < B$$
Which of the sequences given below shows the correct increasing order of energy?
  • $$3s, 3p, 4s, 3d, 5s, 5p, 4d$$
  • $$3s, 3p, 4s, 4p, 4d, 5s, 5p$$
  • $$3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p$$
  • $$3s, 3p, 4s, 5s, 3d, 4d, 5p$$
The radius of the stationary state which is also called Bohr radius is given by the expression $$r_n= n^2a_0$$ where the value of $$a_0$$ is:
  • 52.9 pm
  • 5.29 pm
  • 529 pm
  • 0.529 pm
Consider a $$p_{y}$$-orbital of an atom and identify correct statement.
  • $$s-$$orbital of another atom produces $$\pi$$-bond when y is the bond formation axis.
  • $$p_{y}$$-orbital of another atom produces $$\Sigma$$-bond when x is the bond formation axis.
  • $$p_{z}$$-orbital of another atom produces $$\Sigma$$-bond when x is the bond formation axis.
  • $$d_{xy}$$-orbital of another atom produces $$\Sigma$$-bond when x is the bond formation axis.
According to Bohr's theory, the angular momentum for an electron of $${5}^{th}$$ orbit is:
  • $$2.5{h}/{\pi}$$
  • $$5{h}/{\pi}$$
  • $$25{h}/{\pi}$$
  • $$6{h}/{2\pi}$$
An electron with energy $$12.09$$ eV strikes hydrogen atom in ground state and gives its all energy to the hydrogen atom. Therefore hydrogen atom is excited to __________ state.
  • Fourth
  • Third
  • Second
  • First
The number of orbital having values of n = 4 and l = 3 :
  • 3
  • 7
  • 5
  • 9
Which of the following contains maximum number of atoms?
  • $$0.16\ g\ CH_3$$
  • $$0.28\ g \ N_2$$
  • $$0.36\ g\ C_6H_{12}O_6$$
  • $$1.1\ g \ CO_2$$
The correct order of increasing energy of atomic orbital is:
  • $$5p<4f<6s<5d$$
  • $$5p<6s<4f<5d$$
  • $$4f<5p<5d<6s$$
  • $$5p<5d<4f<6s$$
One requires 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in:
  • visible region
  • infrared region
  • ultraviolet region
  • microwave region
In the Bohr model of the hydrogen atom.
  • The radius of the $$n^{th}$$ orbit is proportional to $$n^{2}$$
  • The total energy of the electron in the $$n^{th}$$ orbit is inversely proportional to $$'n'$$
  • The angular momentum of the electron in an orbit is an integral multiple of $$h/2\pi$$
  • The magnitude of the potential energy of the electron in any orbit is greater than its kinetic energy
If the diameter of two different nuclei are in the ratio 1 : 2, then their mass number are in the ratio: 
  • 1 : 2
  • 8 : 1
  • 1 : 8
  • 1 : 4
In a Bohr's model of an atom when an electron jumps from n=1 to n=3, how much energy will be emitted or absorbed in erg?
  •  $$2.15\times { 10 }^{ -11 }$$
  • $$0.191\times { 10 }^{ -10 }$$
  • $$2.389\times { 10 }^{ -12 }$$
  • $$0.239\times { 10 }^{ -10 }$$
Consider $$\alpha-$$particles, $$\beta-$$particles & $$\gamma-$$ rays, each having an energy of $$0.5\ MeV$$. Increasing order of penetrating of the radiations are:
  • $$\alpha < \beta< \gamma$$
  • $$\alpha< \gamma< \beta$$
  • $$\beta< \gamma< \alpha$$
  • $$\gamma< \beta< \alpha$$
Atomic Radius is of the order $$10^{-8}$$cm & nucleus order of  $$10^{-13}$$cm. Calculate what fraction of atom is occupied by nucleus?
  • $$10^{-14} \times V_{atom}$$
  • $$10^{-13} \times V_{atom}$$
  • $$10^{-15} \times V_{atom}$$
  • $$10^{-11} \times V_{atom}$$
Atomic radius is of the order of $$10^{-8}\ cm$$ and nuclear radius is of the order of $$10^{-13}\ cm$$. The fraction of atom occupied by nucleus is:
  • $$10^{-5}$$
  • $$10^{5}$$
  • $$10^{-15}$$
  • none of these
A certain electronic transition from an excited state to the ground state of the $$H$$ atom in one or more steps gives rise to four lines in the ultraviolet region of the spectrum, how many lines does this transition produce in the infrared region of the spectrum.
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
The orbital diagram in which the Aufbau principle is violated is:
Which of the following orbitals are in the increasing order of energy.
  • $$1s, 2s,  2p,3s$$
  • $$4s, 3s, 3p, 4d$$
  • $$5p, 4d, 5d, 4f, 6s$$
  • $$4p, 2s, 3s, 2p$$
Which series have highest energy in hydrogen spectrum?
  • Balmer
  • Bracket
  • Pfund
  • Lyman
An element has three electrons in the 4th shell, the atomic number of the element is:
  • 13
  • 21
  • 27
  • 31
The electronic configuration, $$1s^22s^22p^63s^23p^63d^9$$, represents a:
  • metal atom
  • non-metal atom
  • non-metallic anion
  • metallic cation
In terms of Bohr radius $${a}_{0}$$, the radius of the second Bohr orbit of a hydrogen atom is given by:
  • $$8{a}_{0}$$
  • $$4{a}_{0}$$
  • $$2{a}_{0}$$
  • $$\sqrt {2}{a}_{0}$$
$$1.00$$ g of $$BaCl_2$$ is treated with excess of aqueous $$AgNO_3$$ and all chlorine is recovered as $$1.38$$ g of AgCl. What is the atomic weight of $$Ba$$? ($$Cl$$ $$=35.5$$, $$Ag$$ $$=108$$)
  • $$137$$
  • $$172.5$$
  • $$33$$
  • $$68.5$$
Radius of $$2nd$$ shell of $$He^+$$ (where $$a_0$$- Bohr radius)
  • $$3a_0$$
  • $$a_0$$
  • $$\dfrac{3}{2}a_0$$
  • $$2a_0$$
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