Ncert Solutions Chemistry Class 11th
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Which of the following will not show deflection from the path on passing through an electric field?
Proton, cathode rays, electron, neutron
Which of the following will not show deflection from the path on passing through an electric field?
Proton, cathode rays, electron, neutron
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: The charged particles get deflected by the electric field. As among the given option only neutron is the particle that is neutral thus it does not get deflected by the electric field.
Upvote 
The arrangement of orbitals on the basis of energy is based upon their (n+l ) value. Lower the value of (n+l ), lower is the energy. For orbitals having same values of (n+l), the orbital with lower value of n will have lower energy.
The arrangement of orbitals on the basis of energy is based upon their (n+l ) value. Lower the value of (n+l ), lower is the energy. For orbitals having same values of (n+l), the orbital with lower value of n will have lower energy.
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Based upon the above information, arrange the following orbitals in the increasing order of energy.
(a) 1s, 2s, 3s, 2p
(b) 4s, 3s, 3p, 4d
(c) 5p, 4d, 5d, 4f, 6s
(d) 5f, 6d, 7s, 7p
Thus, the
Upvote Calculate the total number of angular nodes and radial nodes present in 3p orbital
Calculate the total number of angular nodes and radial nodes present in 3p orbital
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Ans: The number of radial nodes is given by n-l-1, where n is principal quantum number, l is azimuthal quantum number. The number of angular nodes is given by n-l, where n is principal quantum number, l is azimuthal quantum number.
Upvote Which of the following orbitals are degenerate?
3dxy , 4dxy , 3dz2, 3dyz , 4dyz ,4dz2
Which of the following orbitals are degenerate?
3dxy , 4dxy , 3dz2, 3dyz , 4dyz ,4dz2
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Ans: In a multielectron atomic system the energy of an electron depends not only on its principal quantum number (shell), but also on its azimuthal quantum number (subshell). Electrons having the same shells and same subshells have
Upvote Nickel atom can lose two electrons to form Ni2+ ion. The atomic number of nickel is 28. From which orbital will nickel lose two electrons.
Nickel atom can lose two electrons to form Ni2+ ion. The atomic number of nickel is 28. From which orbital will nickel lose two electrons.
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Ans: The electronic configuration of nickel is 1s2 2s2 2p6 3s2 3p6 3d8 4s2 , thus it loses electrons from its 4s orbital as its energy is higher compared to the other orbital.
Upvote Show the distribution of electrons in oxygen atoms (atomic number 8) using an orbital diagram.
Show the distribution of electrons in oxygen atoms (atomic number 8) using an orbital diagram.
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Ans: The electronic configuration of oxygen atom is 1s2 2s2 2p4 and its orbital diagram is given by
Upvote Arrange s, p and d sub-shells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in them.
Arrange s, p and d sub-shells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in them.
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Ans: The effective nuclear charge (Zeff) is defined as the net positive charge experienced by the outermost electrons in the atom. With the increase of Azimuthal quantum number (l) the Zeff experienced by the electron decreases. He
Upvote Why was a change in the Bohr Model of atom required? Due to which important development (s), concept of movement of an electron in an orbit was replaced by, the concept of probability of finding electron in an orbital? What is the name given to the changed model of atom?
Why was a change in the Bohr Model of atom required? Due to which important development (s), concept of movement of an electron in an orbit was replaced by, the concept of probability of finding electron in an orbital? What is the name given to the changed model of atom?
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: The drawbacks of Bohr’s model were
(i) It was unable to explain the spectra for multi-electron systems
(ii) It could not explain the molecule formation through chemical bonds. The two important developments that contributed sig
Upvote Calculate the energy and frequency of the radiation emitted when an electron jumps from n = 3 to n = 2 in a hydrogen atom.
Calculate the energy and frequency of the radiation emitted when an electron jumps from n = 3 to n = 2 in a hydrogen atom.
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: We have
v= 109677 [1/ni 2 - 1/nf 2 ]
Given, ni = 3 and nf =2
D E= hcv = 109677 [1/ni 2 - 1/nf 2 ]
DE = - 3.052 × 10-19J
n =DE /h= 4.606 × 1016Hz
Upvote When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociate to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula
v= 109677 [1/ni 2 - 1/nf 2 ]
What points of Bohr’s model of an atom can be used to arrive at this formula? Based on these points derive the above formula giving description of each step and each term.
When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociate to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula
v= 109677 [1/ni 2 - 1/nf 2 ]
What points of Bohr’s model of an atom can be used to arrive at this formula? Based on these points derive the above formula giving description of each step and each term.
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: The points of the Bohr's model that can be consider are as follows: -
(i) Electrons revolve around the nucleus in a fixed orbit with fixed energy
(ii) The energy is absorbed or released when the electron moves from one energy l
Upvote