General
✓✗The spectrum of He is expected to be similar to that
- H
- Li+
- Na
- He+
General
✓✗What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?
n = 3,
= 1 and m = –1
n = 3,
= 1 and m = –1- 4
- 2
- 10
- 6
General
✓✗The number of spherical nodes in 3p orbitals are/is
- one
- three
- none
- two
General
✓✗4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is
- 5f > 6p > 4d > 5p
- 5f > 6p > 5p > 4d
- 6p > 5f > 5p > 4d
- 6p > 5f > 4d > 5p
General
✓✗The electronic configuration of Cu (atomic number 29) is
- 1s2 2s22p6 3s23p6 4s23d9
- 1s2 2s22p6 3s23p63d10 4s1
- 1s2 2s22p6 3s23p6 4s24p6 5s25p1
- 1s2 2s22p6 3s23p6 4s24p63d3
General
✓✗The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 ´ 10–18 g cm s–1. The uncertainty in electron velocity is (mass of an electron is 9 ´ 10–28 g)
- 1 ´ 105 cm s–1
- 1 ´ 1011 cm s–1
- 1 ´ 109 cm s–1
- 1 ´ 106 cm s–1
General
✓✗The orbital angular momentum of a p-electron is given as
General
✓✗The order of filling of electrons in the orbitals of an atom will be
- 3d, 4s, 4p, 4d, 5s
- 4s, 3d, 4p, 5s, 4d
- 5s, 4p, 3d, 4d, 5s
- 3d, 4p, 4s, 4d, 5s
General
✓✗What will be the longest wavelength line in Balmer series of spectrum?
- 546 nm
- 656 nm
- 566 nm
- 556 nm
General
✓✗The orientation of an atomic orbital is governed by
- principal quantum number
- azimuthal quantum number
- spin quantum number
- magnetic quantum number
General
✓✗If uncertainty in position and momentum are equal, then uncertainty in velocity is
General
✓✗Given: The mass of electron is 9.11 ´ 10–31 kg, Planck constant is 6.626 ´ 10–34 J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is
- 5.79 ´ 105 m s–1
- 5.79 ´ 106 m s–l
- 5.79 ´ 107 m s–1
- 5.79 ´ 108 m s–1
General
✓✗The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is
- 0.53 Å
- 1.06 Å
- 0.17 Å
- 0.265 Å
General
✓✗Based on equation E = – 2.178 ´ 10–18 J 
, certain conclusions are written. Which of them is not correct?
, certain conclusions are written. Which of them is not correct?- Equation can be used to calculate the change in energy when the electron changes orbit.
- For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.
- The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.
- Larger the value of n, the larger is the orbit radius.
General
✓✗The ion that is isoelectronic with CO is
- CN–
- N2+
- O2–
-
