cl 11th structure of atom mcq q and ans
Answers
Answer:
Maximum number of electrons in a subshell with l = 3 and n = 4 is [CBSE AIPMT 2012]
A
10
B
12
C
14
D
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Structure of Atom | Atomic Structure: MCQs | Question – Paper 1 11
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Topic: Structure of Atom, Test No.: 01, Total MCQs: 15
Question 1
Maximum number of electrons in a subshell with l = 3 and n = 4 is [CBSE AIPMT 2012]
A
10
B
12
C
14
D
16
Question 2
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is [CBSE AIPMT 2012]
A
5, 0, 0, +
B
5, 1, 0, +
C
5, 1, 1, +
D
6, 0, 0, +
Question 3
Identify the wrong statement in the following [CBSE AIPMT 2012]
A
Atomic radius of the elements increases as one moves down the first group of the periodic table
B
Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the
C
Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
D
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
Question 4
The work function (f) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is [IIT JEE 2011]
Metal
Li
Na
K
Mg
Cu
Ag
Fe
Pt
W
f(eV)
2.4
2.3
2.2
3.7
4.8
4.3
4.7
6.3
4.75
A
4
B
6
C
8
D
12
Question 5
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at: [AIEEE 2011]
A
518 nm
B
1035 nm
C
325 nm
D
743 nm
Question 6
The energy of an electron in first Bohr orbit of H-atom is –13.6 eV. The possible energy value of electron in the excited state of Li2+ is [West Bengal JEE 2011]
A
– 122.4 eV
B
30.6 eV
C
– 30.6 eV
D
13.6 eV
Question 7
The electronic transitions from n = 2 to n = 1 will produce shortest wavelength in (where n = principal quantum state) [West Bengal JEE 2011]
A
Li+2
B
He+
C
H
D
H+
Question 1.
The increasing order (lowest first) for the values of e/m (charge/mass) for
(a) e, p, n, α
(b) n, p, e, α
(c) n, p, α, e
(d) n, α, p, e
Answer
Answer: (d) n, α, p, e
Explanation:
(i) (e/m) for (i) neutron = (01) = 0
(ii) α− particle = (24) = 0.5
(iii) Proton = (11) = 1
(iv) electron = (11837) = 1837.
Question 2.
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol-1. The energy required to excite the electron in the atom from n = 1 to n = 2 is
(a) 8.51 × 105 J mol-1
(b) 6.56 × 105 J mol-1
(c) 7.56 × 105 J mol-1
(d) 9.84 × 105 J mol-1
Answer
Answer: (d) 9.84 × 105 J mol-1
Explanation:
Energy required when an electron makes transition from n = 1 to n = 2
E2=−(1.312 × 106 × (1)²)/(2²)
= −3.28 × 105 J mol-1
E1 = −1.312 × 106 J mol-1
ΔE = E2 − E1
=−3.28 × 105−(−13.2 × 106)
ΔE = 9.84×105 J mol-1
Question 3.
or a given principal level n = 4, the energy of its subshells is in the order
(a) s < p < d < f
(b) s > p > d > f
(c) s < p < f < d
(d) f < p < d < s
Answer
Answer: (a) s < p < d < f
Explanation:
Order of energy is:
s < p < d < f
