Reasons of Stability
Trending Questions
Q. The energy required to break one mole of Cl−Cl bonds in Cl2 is 242 kJ mol−1. The longest wavelength of light capable of breaking a single Cl−Cl bond is:
(c=3×108 m/s and NA=6.02×1023 mol−1)
(c=3×108 m/s and NA=6.02×1023 mol−1)
- 494 nm
- 594 nm
- 640 nm
- 700 nm
Q.
The binding energy of an electron in the ground state of an atom is equal to Find the energy required to remove both the electrons from the atom?
Q. Which state of Be3+ has the same orbit radius as that of the ground state of hydrogen atom?
- 3
- 2
- 4
- 5
Q.
What will happen if alpha particles strike electron in gold foil experiment performed by rutherford?
Q. Different lines in Lyman series of hydrogen spectrum lies in
- UV
- far IR
- Visible
- IR
Q. The electronic configuration with maximum exchange energy will be
- 3d1xy 3d1yz 3d1zx 4s1
- 3d2xy 3d2yz 3d2zx 3d2x2−y2 3d1z24s1
- 3d1xy 3d1yz 3d1zx 3d1x2−y2 3d2z24s2
- 3d2xy 3d2yz 3d2zx 3d2x2−y2 3d2z24s1
Q. Which of the following orbital has spherical symmetry:
- s orbital
- p orbital
- dxy orbital
- dz2 orbital
Q. Hydrogen atom has only one electron, so mutual repulsion between electrons is absent. However, in multielectron atoms mutual repulsion between the electrons is significant. How does this affect the energy of an electron in the orbitals of the same principal quantum number in multielectron atoms?
Q. According to Octate Rule, in the outermost shell there can be maximum 8 electrons. But what about the third shell or M-shell, which can occupy 18 electrons
Q. The orbital diagrams of two atoms 'X' and 'Y' are given. Which of the following subshell will be more stable
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/726760/original_OA.PNG)
- For X, exchange energy is maximum and have more stability
- For X, exchange energy is minimum and has more stability
- For Y, exchange energy is maximum and has more stability
- For Y, exchange energy is minumum and has more stability
Q. The spin-only magnetic moment of a free ion is √8 B.M. The spin angluar momentum of the electron is xh2π. Find the value of x2.
Q. In the hydrogen atom spectrum, the emission of the least energetic photon takes place during the transition from n=6 energy level to n= _______ energy level.
- 3
- 5
- 1
- 4
- 2
Q. For 1s orbital of Hydrogen atom radial wave function is given as:
R(r)=1√π(1a0)3/2e−r/a0 where a0=0.529 A∘)
The ratio of radial probability density of finding electron at r=ao to the radial probability density of finding electron at the nucleus is given as (x.e−y). Calculate the value of (x + y)
R(r)=1√π(1a0)3/2e−r/a0 where a0=0.529 A∘)
The ratio of radial probability density of finding electron at r=ao to the radial probability density of finding electron at the nucleus is given as (x.e−y). Calculate the value of (x + y)
Q. What is the maximum number of electrons present in an orbit whose angular momentum is 3hπ?
-
72
-
64
36
- 81
Q. Assertion :The electronic configurations in which all of the orbitals of the same subshell are either completely filled or are exactly half filled are more stable. Reason: The completely filled or exactly half filled shells possess a symmetrical distribution of electrons and allow their maximum number of exchanges.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Assertion is incorrect but Reason is correct
Q. Assertion :The angular momentum of d-orbitals is √6h2π. Reason: Angular momentum of e− in orbit is mvr=nh2π.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Assertion is incorrect but Reason is correct
Q. The ratio of angular momentum in 3rd orbit and orbital angular momentum of 3d-orbital is:
- √32
- √23
- √6
- 1√6
Q. Calculate the radius of Bohr's first orbit for hydrogen atom and the energy of electron in this orbit:
- -2.178 × 10−18 J
- 21.78 × 10−18 J
- 2.170 × 10−18 J
- 21.88 × 10−18 J
Q. Is energy of electrons same in same orbit?
Q. Helium nucleus is composed of two protons and two neutrons. If the atomic mass is 4.00388, how much energy is released when the nucleus is constituted?
(Mass of proton =1.00757, Mass of neutron =1.00893)
(Mass of proton =1.00757, Mass of neutron =1.00893)
- 2710MeV
- 271MeV
- 27.12MeV
- 2.71MeV
Q. The binding energy of an electron in the ground state of an atom is equal to 24.6 eV. Find the energy required to remove both the electrons from the atom.
- 79 eV
- 89 eV
- 99 eV
- 69 eV
Q.
Lattice energy of an ionic compound depends upon
Packing of ions only
Charge on the ion and size of the ion
Size of the ion only
Charge on the ion only
Q.
The neutron was discovered by
Marie Curie
Pierre Curie
James Chadwick
Rutherford
Q.
How should we find the number of electron pairs in a molecule like C2H2 using the formula (V+L+A-C)÷2.
WHERE V= VALENCE ELECTRONS, .
L=LIGANDS, .
A=ANIONIC CHARGE,
C=CATIONIC CHARGE, ...???
Q. The difference in angular momentum associated with the electron in two successive orbits of hydrogen atom is xh/2π.
The value of x is :
The value of x is :
Q. The value of Rydberg constant is :
- 1.09678×107 per meter
- 1.09876×107 per meter
- 1.07876×107per meter
- 1.07678×107per meter
Q. Calculate the number of neutrons in 18mL of water. (Density of water =1).
Q. A body of mass 'M'is revolving in a vertical circle of radius 'R' what is the difference in the kinetic energies at the bottom and top portion of the circle?
Q. The difference in angular momentum of electrons between any two successive orbits in an atom is :
- h2π
- 2h3π
- 3h5π
- Cannot be determined
Q. If a metal is irradiated with light of frequency 3×1019 sec−1, the electron is emitted with a kinetic energy of 6.625×10−15 J. The threshold frequency of the metal is
- 2×1019 sec−1
- 6.625×1035 sec−1
- 1.25×1019 sec−1
- 6.625×1019 sec−1