21252.What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?
n = 3, l = 1 and m = –1
n = 3, l = 1 and m = –1
6
4
2
10
21253.With increase in principal quantum number n, the energy difference between adjacent energy levels in hydrogen atom
increases
decreases
remain constant
decreases for lower values of n and increases for higher values of n
21254.What is the wave number of 4th line in Balmer series of Hydrogen spectrum?
(R = 1,09,677 cm–1)
(R = 1,09,677 cm–1)
24,630 cm–1
24,360 cm–1
24,730 cm–1
24,372 cm–1
21255.Which hydrogen-like species will have same radius as that of Bohr orbit of hydrogen atom?
n = 2, Li2+
n = 2, Be3+
n = 2, He+
n = 3, Li2+
21258.Time period of a wave is 5 × 10–3 s, what is the frequency?
5 × 10–3 s–1
2 × 102 s–1
23 × 103 s–1
5 × 102 s–1
21259.The wavelength (in Å) of an emission line obtained for Li2+ during electronic transition from n2 = 2 to n1 = 1 is (R = Rydberg constant)
4/3R
27R/4
3R/4
4/27R
21260.Uncertainty in position of a particle of 25 g in space is 10–5m. Hence, uncertainty in velocity (ms–1) is (Planck's constant h = 6.6 × 10–34 Js)
2.1 × 10–28
2.1 × 10–34
0.5 × 10–34
5.0 × 10–24
21261.The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 × 107 m–1)
91 nm
192 nm
406 nm
9.1 × 10–8nm
21262.How does the Binding Energy per nucleon vary with the increase in the number of nucleons?
Increases continuously with mass number
Decrease continuously with mass number
First decreases and then increases with increase in mass number
First increases and then decreases with increase in mass number
21263.An electronic transition in hydrogen atom results in the formation of Hα line of hydrogen in Lyman series, the energies associated with the electron in each of the orbits involved in the transition (in kcal mol–1) are
–313.6, –34.84
–313.6, –78.4
–78.4, –34.84
–78.4, –19.6
21264.In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?
3 → 2
5 → 2
4 → 1
2 → 5
21265.In the ground state, an element has 13 electrons in its M-shell. The element is_____.
Copper
Chromium
Nickel
Iron
21266.Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 × 103 ms-1
(Mass of proton = 1.67 × 10-27 kg and h = 6.63 × 10-34 Js )
(Mass of proton = 1.67 × 10-27 kg and h = 6.63 × 10-34 Js )
0.032 nm
0.40 nm
2.5 nm
14.0 nm
21267.An electron is moving in Bohr's fourth orbit. Its de-Broglie wavelength is λ. What is the circumference of the fourth orbit?
2/λ
2λ
4λ
4/λ
21269.Which of the following is correct?
1H1 and 2He3 are isotopes
6C14 and 7N14 are isotopes
19K39 and 20Ca40 are isotones
9F19 and 11Na24 are isodiaphers
21270.The frequency of light emitted for the transition n = 4 to n = 2 of He+ is equal to the transition in H atom corresponding to which of the following?
n = 4 to n = 3
n = 3 to n = 1
n = 2 to n = 1
n = 3 to n = 2
21271.An element has 2 electrons in K shell, 8 electrons in L shell, 13 electrons in M shell and one electron in N shell. The element is
Cr
Fe
V
Ti