General
✓✗In hydrogen atom, energy of first excited state is –3.4 eV. Then find out K.E. of same orbit of hydrogen atom
- +3.4 eV
- +6.8 eV
- –13.6 eV
- +13.6 eV
General
✓✗What will be the longest wavelength line in Balmer series of spectrum?
- 546 nm
- 656 nm
- 566 nm
- 556 nm
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
✓✗In a given atom no two electrons can have the same values for all the four quantum numbers. This is called
- Hund's Rule
- Aufbau principle
- Uncertainty principle
- Pauli's Exclusion principle
General
✓✗Maximum number of electrons in a subshell of an atom is determined by the following
-
-
- 2n2
-
General
✓✗The number of spherical nodes in 3p orbitals are/is
- one
- three
- none
- two
General
✓✗In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is [Given that Bohr radius, a0 = 52.9 pm]
- 211.6 pm
- 211.6 p pm
- 52.9 p pm
- 105.8 pm
General
✓✗The spectrum of He is expected to be similar to that
- H
- Li+
- Na
- He+
General
✓✗Which one of the following is not isoelectronic with O2–?
- Tl+
- Na+
- N3–
- F–
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
✓✗According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
- n = 6 to n = 1
- n = 5 to n = 4
- n = 6 to n = 5
- n = 5 to n = 3
General
✓✗The energy of second Bohr orbit of the hydrogen atom is –328 kJ mol–1; hence the energy of fourth Bohr orbit would be
- – 41 kJ mol–1
- – 82 kJ mol–1
- – 164 kJ mol–1
- – 1312 kJ mol–1
General
✓✗The following quantum numbers are possible for how many orbitals?
n = 3,
= 2, m = +2
n = 3,
= 2, m = +2- 1
- 2
- 3
- 4
General
✓✗Which one is a wrong statement?
- Total orbital angular momentum of electron in s-orbital is equal to zero.
- An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
-
The electronic configuration of N atom is
-
The value of m for
is zero.
General
✓✗In a Bohr's model of an atom, when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed?
- 2.389 ´ 10–12 ergs
- 0.239 ´ 10–10 ergs
- 2.15 ´ 10–11 ergs
- 0.1936 ´ 10–10 ergs