Which of the following pair of ions have same paramagnetic moment
A. Cu2+ , Ti3+
B. Mn2+ , Cu2+
C. Ti4+ , Cu2+
D. Ti3+ , Ni2+
Which of the following elements has least number of electrons in its M shell ?
A. K
B. Mn
C. Ni
D. Sc
The atomic numbers of elements X, Y and Z are 19, 21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order
A. Z > X > Y
B. X > Y > Z
C. Z > Y > X
D. Y > Z > X
An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is X. What is the circumference of the fourth orbit
A. 2/λ
B. 2λ
C. 4λ
D. 4/λ
Which of the following pair of transition metal ions, have the same calculated values of magnetic moment
A. Ti2+ and V2+
B. Fe2+ and Cu2+
C. Cr2+ and Fe2+
D. Co2+ and Ti2+
The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is (16/15)hr cm .What is the value of n2 (R= Rydberg Constant)
A. 2
B. 3
C. 4
D. 1
The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively
A. 4,12,32
B. 4,16,30
C. 4,16,32
D. 4,32,64
What is the correct order of spin only magnetic moment (in BM) of Mn2+, Cr2+ and V2+ ?
A. Mn2+ > V2+ > Cr2+
B. V2+ > Cr2+> Mn2+
C. Mn2+ > Cr2+ > V2+
D. Cr2+ > V2+ > Mn2+
The energy of a photon is 3 x 10-12 ergs.What is its wavelength in nm ?( h = 6.62 x 10 -27ergs-s ; c = 3 x 10 10 cm/s )
A. 662
B. 1324
C. 66.2
D. 6.62
Which one of the following sets correctly represent the increase in the paramagnetic property of the ions
A. Cu2+ < V2+ < Cr2+ < Mn2+
B. Cu2+ < Cr2+ < V2+ < Mn2+
C. Cu2+ < V2+ < Mn2+< Cr2+
D. V2+ < Cu2+ < Cr2+ < Mn2+
Electrons with a kinetic energy of 6.023 x 104 J/mol are evolved from a surface of a metal, when it is exposed to radiation of wavelength of 600 nm, The minimum amount of energy required to remove an electron from the metal atom is
A. 2.3125 X 10-19 J
B. 3 X 10-19 J
C. 6.02 X 10-19 J
D. 6.62 X 10-34 J
The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be
A. 25 : 9
B. 5 : 3
C. 9 : 25
D. 3 : 5
How many electrons are present in the M shell of an atom of an clement with atomicnumber 24 (Z = 24) ?
A. 5
B. 6
C. 12
D. 13
5.85 gms of NaCl (Mol. wt. 58.5) is dissolved in water and the solution made up to 500ml; the molarity of the solution will be
A. 0.1
B. 0.2
C. 1.0
D. 0.117
The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is
A. Spin
B. Azimuthal
C. Magnetic
D. Principal
When the same amount of zinc is treated with excess of H2SO4 and with excess NaOH, the ratio of the volume of H2 evolved is
A. 3 : 2
B. 1 : 2
C. 2 : 1
D. 1 : 1
In photoelectric effect, if the energy required to overcome the attractive forces on the electron,(work functions) of Li, Na and Rb are 2.41eV, 2.30eV and 2.09eV respectively, the work function of ‘K’ could approximately be in eV
A. 2.52
B. 2.20
C. 2.35
D. 2.01