Which of the following is a pair of isoelectronic species?
Options
(a) Cl₂O₃, ICl₂⁻ (b) ICl₂⁻, CIO₂ (c) IF₂⁺, I₃⁻ (d) CIO₂⁻, CIF₂⁺
Correct Answer:
CIO₂⁻, CIF₂⁺
Explanation:
Number of electrons in CIO₂⁻ […]
Which one of the following species does not exist under normal conditions?
Options
(a) Be₂⁺ (b) Be₂ (c) B₂ (d) Li₂
Correct Answer:
Be₂
Explanation:
Bond order of Be₂ is zero hence it […]
If the energy of a photon is given as : =3.03 × 10⁻¹⁹J then, the wavelength (λ) of the photon is :
Options
(a) 6.56 nm (b) 65.6 nm (c) 656 nm (d) […]
The de-Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is
Options
(a) 6.626 x 10⁻³⁴ m (b) 13.20 x 10⁻³⁴ m (c) 10.38 x 10⁻²¹ m (d) […]
The momentum of a particle having a de Broglie wavelength of 10⁻¹⁷metres is (Given h= 6.625 × 10⁻³⁴Js)
Options
(a) 3.3125 x 10⁻⁷kg ms⁻¹ (b) 26.5 x 10⁻⁷kg ms⁻¹ (c) 6.625 x 10⁻¹⁷kg […]
If ionization potential for hydrogen atom is 13.6eV, then ionization potential for He⁺ will be
Options
(a) 54.4 eV (b) 6.8 eV (c) 13.6 eV (d) 24.5 eV
Correct Answer:
54.4 eV
Explanation: […]
The correct set of four quantum numbers for the valence electron of rubidium atom(Z=37) is
Options
(a) 5,1,1,+½ (b) 6,0,0,+½ (c) 5,0,0,+½ (d) 5,1,0,+½
Correct Answer:
5,0,0,+½
Explanation:
₃₇Rb=₃₆[Kr] 5s Its valence electron […]
The order of filling of electrons inthe orbitals of an atom will be
Options
(a) 3d, 4s, 4p, 4d, 5s (b) 4s, 3d, 4p, 5s, 4d (c) 5s, 4p, 3d, 4d, 5s (d) […]
The maximum number of electrons in a subshell is given by the expression
Options
(a) 4l– 2 (b) 4l+ 2 (c) 2l+ 2 (d) 2n²
Correct Answer:
4l+2
Explanation:
No. of orbitals in […]
Maximum number of electrons in a subshell of an atom is determined by the following:
Options
(a) 2l + 1 (b) 4l – 2 (c) 2n² (d) 4l + 2
Correct Answer:
4l + […]
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