MABS Institution
11th Chemistry Monthly Test - 1 ( Quantum Mechanical Model of Atom )-Aug 2020
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An atom of an element contains 35 electrons and 45 neutrons. Deduce
(i) the number of protons
(ii) the electronic configuration for the element
(iii) All the four quantum numbers for the last electron -
Write a note on Thomson's plum pudding model of an atom.
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Define orbital? what are the n and 1 values for 3px and 4dx2-y2 electron?
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Consider the following electronic arrangements for the d5 configuration.
(a)\(\upharpoonleft \downharpoonright \) \(\upharpoonleft \downharpoonright \) \(\upharpoonleft \) (b)
\(\upharpoonleft \) \(\upharpoonleft \) \(\upharpoonleft \) \(\upharpoonleft \downharpoonright \) (c)
\(\upharpoonleft \) \(\upharpoonleft \) \(\upharpoonleft \) \(\upharpoonleft \) \(\upharpoonleft \) (i) which of these represents the ground state
(ii) which configuration has the maximum exchange energy. -
How fast must a 54g tennis ball travel in order to have a de Broglie wavelength that is equal to that of a photon of green light 5400\(\overset { 0 }{ A } \) ?
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Which quantum accounts for the orientation of the electron orbital?
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The quantum mechanical treatment of the hydrogen atom gives the energy value:
\({ E }_{ n }=\frac { -13.6 }{ { n }_{ 2 } } ev{ \quad atom }^{ -1 }\)
(i) use this expression to find AE between n = 3 and m=4
(ii) Calculate the wavelength corresponding to the above transition. -
Calculate the uncertainty in position of an electron, if Av = 0.1% and \(\upsilon \) = 2.2 x 106 ms-1.
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Describe the Autbau principle
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Orbits are also called as stationary states. Say whether the above statement is true or false.Justify your answer
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Calculate the total number of angular nodes and radial nodes present in 3p-orbital.
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An electron a proton which one will have a higher velocity to produce matter waves of the same wavelength? Explain it
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How does the Bohr theory of the hydrogen atom differ from that of Schrodinger?
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An atom of an element contains 29 electrons and 35 neutrons. Deduce
(i) the number of protons.
(ii) the electronic configuration of the element. -
Write a note on the shape of f orbitals
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The Li2+ ion is a hydrogen like. ion that can be described by the Bohr model. Calculate the Bohr radius of the third orbit and calculate the energy of an electron in 4th orbit.
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A neutral atom of an element has 2K, 8L and 5M electrons. Find out the following.
(i) Atomic number of the element (ii) Total number of s-electrons (iii) Total number of p-electrons (iv) Number of protons in the nucleus (v) Valency of the element -
Suppose that the uncertainty in determining the position of an electron in an orbit is 0.6 \(\mathring{A}\) . What is the uncertainty in its momentum
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The quantum numbers of six electrons are given below. Arrange them in order of increasing energies.If any of these combination(s) has/have the same energy lists.
(i) n=4, l=2 m1 = -2,ms= - \(\frac { 1 }{ 2 } \)
(ii) n= 3, l= 2, m1=1,ms = +\(\frac { 1 }{ 2 } \)
(iii) n= 3, l= 1,m1 =0 ms = +\(\frac { 1 }{ 2 } \)
(iv) n= 3, l= 2,m1 = -2,ms= - \(\frac { 1 }{ 2 } \)
(v) n= 3, l= 1,m1=-1,,ms=+ \(\frac { 1 }{ 2 } \)
(vi) n= 4, l= 1,m1 = 0, ms= +\(\frac { 1 }{ 2 } \) -
What is the de Broglie wave length of an electron, which is accelerated from the rest, through a potential difference of 100V?
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Complete the table given below
S.No Symbol Mass No. Atomic No Proton Neutron Electrons 1. Zn2+ 64 30 - - - 2. Cl- 35 - - 18 18 3. Ar - - 18 22 1 -
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Identify the missing quantum numbers and the sub energy level
n 1 m Sub energy level ? ? 0 4d 3 1 0 ? ? ? ? 5p ? ? -2 3d -
The uncertainty in the position and velocity of a particle are 1 nm and 5.27 X 10-24
ms-1 respectively. Calculate the mass of the particle.
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Protons can be accelerated in particle accelerators. Calculate the wavelength (in A)of such accelerated proton moving at 2.85 x 108 ms-1 (the mass of proton is 1.673x10-27 Kg).
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Calculate the energy required for the process.
\({ He }_{ (g) }^{ + }\longrightarrow { He }_{ (g) }^{ 3+ }+{ e }^{ - }\)
The ionisation energy for the H atom in its ground state is -13..6 ev atom-1