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# Previous Year Questions (2014-20) - Structure of Atom Class 11 Notes | EduRev

## Class 11 : Previous Year Questions (2014-20) - Structure of Atom Class 11 Notes | EduRev

The document Previous Year Questions (2014-20) - Structure of Atom Class 11 Notes | EduRev is a part of the Class 11 Course Chemistry 31 Years NEET Chapterwise Solved Papers.
All you need of Class 11 at this link: Class 11

Q.1. The number of protons, neutrons and electrons in respectively, are :     (2020)
(a) 71, 71 and 104
(b) 175, 104 and 71
(c) 71, 104 and 71
(d) 104, 71 and 71

Ans: c ∴ no. of protons = 71
no. of neutrons = 175 – 71 = 104
no. of electrons = 71

Q.2. 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is    (2019)
(a) 5f > 6p > 5p > 4d

(b) 6p > 5f > 5p > 4d
(c) 6p > 5f > 4d > 5p
(d) 5f > 6p > 4d > 5p
Ans:
a

(n + l) values for,
4d = 4 + 2 = 6
5p = 5 + 1 = 6
5f = 5 + 3 = 8
6p = 6 + 1 = 7
∴ Correct order of energy would be
5f > 6p > 5p > 4d

Q.3. Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?    (2019)
(a) Lyman series
(b) Balmer series
(c) Paschen series
(d) Brackett series
Ans:
b

In H-spectrum, Balmer series transitions fall in visible region.

Q.4. Which one is a wrong statement ?    (2018)
(a) Total orbital angular momentum of electron in 's' orbital is equal to zero
(b) An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
(c) The electronic configuration of N atom is (d) The value of m for dz2 is zero
Ans:
c

The correct configuration of 'N' is Q.5. Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :    (2018)  (a) 1
(b) 2
(c) 3
(d) 4
Ans:
a  Q.6. Two electrons occupying the same orbital are distinguished by :    (2016)
(a) Spin quantum number
(b) Principal quantum number
(c) Magnetic quantum number
(d) Azimuthal quantum number
Ans:
a

Same orbital can have two different values of spin of e- of +1/2 and -1/2 (spin quantum number)

Q.7. The angular momentum of electron in 'd' orbital is equal to:    (2015)
(a) 0 h
(b) √6h
(c) √2h
(d) 2√3h
Ans:
b

Angular momentum of electron in 'd‘ orbital = Q.8. Magnetic moment 2.84 B.M. is given by : (At. Nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)    (2015)
(a) Co2+
(b) Ni2+
(c) Ti3+
(d) Cr2+
Ans:
b

Magnetic moment = = 2.84 i.e., n = 2
Ni+2 i.e., 3d8 contains two unpaired electrons

Q.9. The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following ?    (2015)
(a) p - electrons in Ne (Z = 10)
(b) s - electrons in Mg (Z = 12)
(c) p - electrons in Cl (Z = 17)
(d) d - electrons in Fe (Z = 26)
Ans:
c Q.10. Magnetic moment 2.83 BM is given by which of the following ions ?
(At. Nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)    (2014)
(a) Cr3+
(b) Mn2+
(c) Ti3+
(d) Ni2+
Ans:
d Q.11. What is the maximum number of orbitals that can be identified with the following quantum numbers ? n = 3,l= 1, ml = 0    (2014)
(a) 3
(b) 4
(c) 1
(d) 2
Ans:
c

3p orbital can have n = 3, = 1 and ml = 0.

Q.12. Calculate the energy in joule corresponding to light of wavelength 45 nm :
(Planck's constant h = 6.63 × 10−34 Js; speed of light c = 3 × 108 ms−1)    (2014)
(a) 4.42 × 10-15
(b) 4.42 × 10-18
(c) 6.67 × 1015

(d) 6.67 × 1011

Ans: b Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

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