General
✓✗The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within 5.0 ´ 10–26 kg m s–1. The minimum uncertainty in the measurement of the momentum of the helium atom is
- 8.0 ´ 10–26 kg m s–l
- 80 kg m s–1
- 50 kg m s–1
- 5.0 ´ 10–26 kg m s–1
General
✓✗How many electrons can fit in the orbital for which n = 3 and 
= 1?
= 1?- 2
- 6
- 10
- 14
General
✓✗Which one is the wrong statement?
-
The uncertainty principle is
- Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.
- The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.
-
de-Broglie's wavelength is given by
, where m = mass of the particle, v = group velocity of the particle.
General
✓✗According to law of photochemical equivalence the energy absorbed (in ergs/ mole) is given as (h = 6.62 ´ 10–27 ergs, c = 3 ´ 1010 cm s–1 NA = 6.02 ´ 10–23 mol–1)
General
✓✗Isoelectronic species are
- CO, CN–, NO+, C22–
- CO–, CN, NO, C2–
- CO+, CN+, NO+, C2
- CO, CN, NO, C2
General
✓✗A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be (h = 6.6 ´ 10–34 J s)
- 6.6 ´ 10–32 m
- 6.6 ´ 10–34 m
- 1.0 ´ 10–35 m
- 1.0 ´ 10–32 m
General
✓✗Which one of the following is not isoelectronic with O2–?
- Tl+
- Na+
- N3–
- F–
General
✓✗The orbital angular momentum of a p-electron is given as
General
✓✗The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following?
- d-electrons in Fe (Z = 26)
- p-electrons in Ne (Z = 10)
- s-electrons in Mg (Z = 12)
- p-electrons in Cl (Z= 17)
General
✓✗Number of unpaired electrons in N2+ is/are
- 2
- 0
- 1
- 3
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
✓✗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
✓✗Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?
- Brackett series
- Lyman series
- Balmer series
- Paschen series
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