CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 14 - MCQExams.com

In an atom $$  2 \mathrm{K}, 8 \mathrm{L}, 8 \mathrm{M}, 2 \mathrm{N}  $$ electrons, the number of electrons present.If $$  \mathrm{m}=0, \mathrm{s}=1 / 2,  $$ are:
  • $$6$$
  • $$2$$
  • $$8$$
  • $$16$$
Which of the following statements in relation to the hydrogen atom is correct?
  • 3s orbital is lower in energy than 3p orbital.
  • 3p orbital is lower in energy than 3d orbital.
  • 3s and 3p orbital are of lower energy than 3d orbital.
  • 3s, 3p and 3d orbital all have the same energy.
The energy of an electron in the first Bohr orbit for $$He^+$$ ion is $$-54.4eV.$$ Which one of the following is a possible excited state for electron in Bohr orbit of $$He^+$$ ion ?
  • $$-6.04eV$$
  • $$-6.08eV$$
  • $$-1.7eV$$
  • $$+1.36eV$$
The electrons identified by quantum  number $$n $$ and $$l$$:
$$(1)n=4,l=1\quad \quad \quad (2)n=4,l=0\\ (3)n=3,l=2\quad \quad \quad (4)n=3,l=1$$

The correct order of increasing energy is: 
  • (4) < (2) < (3) < (1)
  • (2) < (4) < (1) < (3)
  • (1) < (3) < (2) < (4)
  • (3) < (4) < (2) < (1)
In the Bohr's model of the hydrogen atom, let r, v and E represent the orbit radius, speed of the electron, respectively. Which of the following relation is proportional to the orbit number $$n$$? 
  • $$v\cdot r$$
  • $$r/E$$
  • $$r/V$$
  • $$r\cdot E$$
The energy of an electron in first Bohr orbit of $$H$$ atom is $$-13.6 eV$$. The possible energy value (s) of excited state(s) for the electron in the Bohr orbits of hydrogen is/are:
  • $$- 3.4\  eV $$
  • $$- 4.2 \  eV $$
  • $$6.8  \  eV  $$
  • $$+6.8 \ eV$$
Which one is the ground state?
The d orbital(s) involved in the formation of the complex(C) will be?
  • $$d_{z^2}$$
  • $$d_{x^2-y^2}$$ and $$d_{z^2}$$
  • $$dxy$$ and $$d_{x^2-y^2}$$
  • $$d_{x^2-y^2}$$
In what region(s) of the spectrum does this series occur? Visible region is from $$360$$ to $$780\ nm$$.
  • Visible only
  • Infrarted only
  • Visible and infrared
  • Visible and ultraviolet
All of the following possess complete d-shells except: 
  • $$Ag^+$$
  • $$Cu^{2+}$$
  • $$Ga^{3+}$$
  • $$Zn^{2+}$$
The time period of revolving in the third orbit of $$Li^{2+}$$ ion is $$x$$ second. The time period of revolution in the second orbit of $$He^+$$ ion should be
  • $$x\ s$$
  • $$\dfrac {3}{2}x\ s$$
  • $$\dfrac {2}{3}x\ s$$
  • $$\dfrac {8}{27}x\ s$$
The atom/ion is
  • $$H$$
  • $$D$$
  • $$He^{+}$$
  • $$Li^{+2}$$
Aluminium chloride exists as a dimer because aluminium has______
  • greater $$I.P.$$
  • incomplete $$p-$$orbital
  • larger radius
  • high nuclear charge
Which element is the end product of each natural radioactive series?
  • Sn
  • Bi
  • Pb
  • C
$$\alpha$$ -particles can be detected using:
  • Thin aluminum sheet
  • Barium sulphate
  • Zinc sulphide screen
  • Gold foil
Tritium undergoes radioactive decay giving:
  • $$\alpha$$ - particles
  • $$\beta$$ - particles
  • Neutrons
  • None of these
Bohr model of an atom could not account for :
  • Emission spectrum
  • Absorption spectrum
  • Line spectrum of hydrogen
  • Fine spectrum
Choose the element which is not radioactive.
  • Cm
  • No
  • Mo
  • Md
The French physicist Louis de Broglie in 1924 postulated that matter, like radiation, should exhibit a dual behaviour. He proposed the following relationship between the wavelength $$\lambda$$ of a material particle, its linear momentum p and Planck constant h. $$\lambda=\dfrac {h}{p}=\dfrac{h}{mv}$$. The de Broglie relation implies that the wavelength of a particle should decrease as its velocity increases. It also implies that for a given velocity heavier particles should have a shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de Broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration. The experimental confirmation of the de Broglie relation was obtained when Davisson and Germer, in 1927, observed that a beam of electrons is diffracted by a nickel crystal. As diffraction is a characteristic property of waves, hence the beam of electron behaves as a wave as proposed by de Broglie.

Using Bohr's theory, the transition, so that the electrons de-Broglie wavelength becomes 3 times of its original value in $$He^{+}$$ ion will be
  • $$2 \rightarrow 6$$
  • $$2 \rightarrow 4$$
  • $$1 \rightarrow 4$$
  • $$1 \rightarrow 6$$
Radioactivity was discovered by
  • Henry Becquerel
  • Rutherford
  • J. J. Thomson
  • Madam Curie
If radium and chlorine combine to from radium chloride the compound is:
  • No longer radioactive
  • Twice as radioactive as radium
  • Half as radioactive as radium
  • As radioactive as radium
The spectrum produced from an element is:
  • atomic spectrum
  • line spectrum
  • absorption spectrum
  • any one of the above
Two elements X and Y have
(i) X has 17 protons and 18 neutrons
(ii) Y has 17 protons and 20 neutrons Both X and Y are
  • Isobars
  • Isotopes
  • Isotones
  • None of the above
Which of the following is discrete in Bohr's theory ?
  • Potential energy
  • Kinetic energy
  • Velocity
  • Angular momentum
The probability of finding electrons in $$d_{xy}$$ orbital is:
  • along X- and Y-axis
  • along X- and Z-axis
  • along Y- and Z-axis
  • at an angle of $$45^\circ$$ with X-axis
The figure shows a graph between $$\ln \left|\dfrac {A_n}{A_1}\right|$$ and $$1n |n|$$ where $$A_n$$ is the area enclosed by the $$n^{th}$$ orbit in a hydrogen like atom. The correct curve is
1819276_b68246e8a335480586785fbfaae83926.png
  • $$4$$
  • $$3$$
  • $$2$$
  • $$1$$
Radioactivity is affected by:
  • temperature
  • pressure
  • electric and magnetic field
  • none of these
One or more answers is/are correct.
In electron capture (radioactive process)
  • a neutron is formed
  • a proton is consumed
  • $$\gamma$$-ray emission takes place
  • X-ray emission takes place
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