The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom?
Li2+ (n = 2)
Li2+ (n = 3)
Be3+ (n = 2)
He+ ( n = 2)
Which of the following set of quantum numbers represents the highest energy of an atom?
n =3, l=2, m=1, s= +1/2
n=4, l=0, m=0, s= -1/2
n=3, l=0, m=4, s= +1/2
n=3, l=1, m=1, s=+1/2
Which of the following electron has minimum energy?
n = 4; l = 0; m= 0; s = +
n= 4; l= 1; m = ±1; s = +
n = 5; l = 0; m = 0; s = +
n = 3; l = 2; m = -2; s = +
How many emission spectral lines are possible when hydrogen atom is excited to nth energy level?
Which of the following corresponds to the energy of the possible excited state of hydrogen?
-13.6 eV
13.6 eV
-3.4 eV
3.4 eV
The correct order of the spin only magnetic moment of metal ions in the following low spin complexes, [V(CN)6]4-, [Fe(CN)6]4-, [Ru(NH3)6]3+ and [Cr(NH3)6]2+ is
V2+ > Cr2+ > Ru3+ > Fe2+
V2+ > Ru3+ > Cr2+ > Fe2+
Cr2+ > V2+ > Ru3+ > Fe2+
Cr2+ > Ru3+ > Fe2+ > V2+
A.
V2+ > Cr2+ > Ru3+ > Fe2+
V2+ has d3 configuration of which all the 3 are unpaired electrons.
Cr2+ has d4 configuration. On low spin the 4 electrons are arranged as one pair and 2 unpaired electrons.
Ru3+ has d5 configuration. In low spin the 5 electrons are arranged as 2 pairs and 1 electron remain unpaired.
Fe2+ has d6 configuration. In low spin complex all the six electroms are paired so no unpaired electrons.
Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect? (The Bohr radius is represented by a0).
The electron can be found at a distance 2a0 from the nucleus.
The probability density of finding the electron is maximum at the nucleus.
The total energy of the electron is maximum when it is at a distance a0 from the nucleus.
The magnitude of the potential energy is double that of its kinetic energy on a an average.