8/13/2019 Dpps -17 Atomic Structure

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Chemistry

Atomic StructureDPPS: 17

1 An orbital that has no radial nodes and two angular nodes is(a) 3s (b) 2s (c) 2p (d) 3d

2 Which statement best describes a 4p-orbital?(a) It has one angular node with two regions of electron density.(b) It has two angular nodes with four regions of electron density.(c) It has two angular nodes with two regions of electron density.(d) It can hold a maximum of six electrons.

3 How many electrons can have the quantum numbers n = 3, l = anything, m1= 1, ms= anything?(a) 2 (b) 4 (c) 1 (d) 6

4 The quantum numbers +1/2 and -1/2 for the electron spin represents(a) Rotation of the electron in clockwise and anti-clockwise directions, respectively(b) Rotation of the electron in anti-clockwise and clockwise directions, respectively(c) Magnetic moments of electron pointing up and down , respectively(d) Two quantum mechanical spin states which have no classical analogues.

5 Which electronic transition in He+ion emits light of wavelength equal to the longest wavelengthemitted in the Balmer series of Li

2+ion?

(a) 43 (b) 53(c) 32 (d) No transition in He

+matches this wavelength

6 Which electronic transition in He

+

emits light of wavelength equal to the longest wavelength emitted inthe Paschen series of H atom?

(a) 96 (b) 86 (c) 85 (d) 73

7 Which of the following statements concerning a radial wave function () of a H-like species is incorrect?

(a) It has properties of standing wave

(b) It changes sign when plotted against distance from nucleus.

(c) It is maximum at r = 0 (at nucleus).

(d) It can have more than one maxima / minima when plotted against distance from nucleus.

8 Which of the following statement concerning probability density (2) and radial distribution function

(4r2

2) for a s-orbital of H-like species is correct?

(a) 2is minimum at nucleus but 4r

2

2is maximum as at nucleus.

(b) 2is maximum at nucleus but 4r

2

2is maximum as at nucleus.

(c) Both 2 and 4r

2

2are maximum at nucleus.

(d) Both 2

and 4r2

2are minimum at nucleus.

9 The number of regions of maximum probability is one for

(a) 1 s (b) 3 p (c) 3 d (d) 4 f

8/13/2019 Dpps -17 Atomic Structure

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Chemistry

Atomic StructureDPPS: 17

10 Which of the following is/are correct for an H-atom?

(a) 1s < 2s < 2p < 3s < 3p (b) 1s < 2s = 2p < 3s = 3p

(c) 1s < 2p < 3d < 4s (d) 1s < 2s < 4s < 3d

11 Which of the followings are correct set of four quantum numbers for an electron in 4d-orbital?

(a) 4, 3, 2, 1/2 (b) 4, 2, 1, 0 (c) 4, 2, -2, +1/2 (d) 4, 2, 1, -1/2

12 Which of the followings are characteristics of wave function ?

(a) must be single valued. (b) must be finite and continuous.

(c)

2dx dy dz = 1. (d) represents a standing wave

13 Which of the followings can be sets of four quantum numbers for the valence electrons of rubidium (Z =

37)?

(a) n = 5, l = 0, m = 0, s = +1/2 (b) n = 5, l = 1, m = 0, s = +1/2

(c) n = 5, l = 1, m = 1, s = +1/2 (d) n = 5, l = 0, m = 0, s = -1/2

14 The spin only magnetic moment of V(Z = 23), Cr(Z = 24) and Mn(Z = 25) are x, y and z respectively.

Which of the following is are correct relationships?

(a) x > y (b) x > z (c) y > z (d) x < z

15 The magnetic moment of Xn+

is 24 BM. Hence, the species can be

(a) Fe2+

(b) Cr2+

(c) Mn3+

(d) Co3+

16 If the Aufbau principle in not followed, the first three quantum numbers (n, l and m) for the valence

electron of K atom may take value

(a) n = 3, l = 1, m = 0 (b) n = 3, l = 2, m = 0

(c) n = 3, l = 1, m = 1 (d) n = 3, l = 2, m = 1

17 If an electron can have three values of spin quantum numbers1 1

, 02 2

and

, which of the

following deduction would be correct?

(a) Li would have in the first period of the periodic table

(b) The total number of elements in the second period would have been ten.

(c) There would have been 27 elements in the fourth period of Periodic Table.

(d) Number of periods would have been less than the number of periods present in modern Periodic

Table.

18 Which of the following is / are correct?

(a) The orbital angular momentum for a d-electron is 62

h

.

(b) The number of orbitals in a shell with principal quantum number n is 2n2.

(c) The correct set of quantum numbers for the last unpaired electron of Cl atom is {3, 1, 1, -1/2}.

(d) The ration of energy in the first Bohr orbit of H-atom to the electron in the first exited state of Be3+

is 1 : 4.