Multiple Choice QuestionsWhat is the wavelength associated with a tennis ball of mass 103 g and travelling at a velocity of 6.626 ms-1 ?[h = 6.626 x 10-34 Js-1].
10-34 m
10-31 m
6.626 m
6.626 × 10-31 m
What is the energy required to move the electron from ground state of H atom to the first excited state? Given that the ground state energy of H atom is 13.6 eV and that the energy En of an electron in nth orbital of an atom or ion of atomic number Z is given by the equation En= - (13.6Z2 /n2).
13.6 eV
3.4 eV
10.2 eV
-10.2 eV
Which electron orbitals are designated by
(i) n = 2, l = 1, m = 0;
(ii) n = 3, l=2, m = O;
(iii) n=4, l = 2, m=1 and
(iv) n = 5, l=3, m=3 respectively?
2p, 3d, 4d and 5f, respectively
2p, 3d, 4d and 5d, respectively
2p, 3d, 4f and 5f, respectively
2p, 3p, 4d and 5f, respectively
Which one of the following represents the correct ratio of the energy of electron in ground state of H atom to that of the electron in the first excited state of Li+?
4 : 9
9 : 4
1 : 4
4 : 1
Which one of the following complexes is an outer orbital complex?
(Atomic number of Mn = 25; Fe = 26; Co = 27 and Ni = 28)
[Fe(CN)6]4-
[Mn(CN)6]4-
[Co(NH3)6]3+
[Ni(NH3)6]2+
Which of the following has the largest number of atoms?
0.5 gm atom of Cu
0.635 gm of Cu
0.25 moles of Cu atoms
1 gm of Cu
A.
0.5 gm atom of Cu
The largest number of atoms can be calculated as-
(a) 0.5 gm atoms of Cu-
Cu = 0.5 × 6.023 × 1023
= 3.011 × 1023 Cu atoms
(b) 0.635 gm of Cu =
= 6.023 × 1021 Cu atoms
(c) 0.25 moles of Cu = 0.25 × 0.623 × 1023
= 1.5 × 1023 Cu atoms
(d) 1 gm Cu =
= 9.48 × 1021 Cu atoms
Therefore, 0.5 gm atom of Cu has maximum number of Cu atoms.
Which of the following will violate Pauli's exclusion principle?
Both (a) and (b)
None of the above
The ratio of the difference in energy between the first and second Bohr orbit to that between the second and third Bohr orbit is
The wave number of hydrogen atom in Lyman series is 82200 cm-1. The electron goes from
n3 → n2
n2 → n1
n4 → n3
None of these
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