Q. What is the electric potential due to a dipole at a point along the axial line at a distance 'r' from the center of the dipole?
-
A.
0
-
B.
k * p / r²
-
C.
k * p / r
-
D.
k * p / 2r
Solution
The potential V = k * p / r, where p is the dipole moment.
Correct Answer: C — k * p / r
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Q. What is the electric potential due to a point charge at a distance r?
-
A.
k * q / r
-
B.
k * q / r^2
-
C.
k * q * r
-
D.
k * q * r^2
Solution
The electric potential V due to a point charge q at a distance r is given by V = k * q / r.
Correct Answer: A — k * q / r
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Q. What is the electric potential due to a point charge of 5 μC at a distance of 2 m?
-
A.
0 V
-
B.
2250 V
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C.
1125 V
-
D.
4500 V
Solution
Electric potential V = k * q / r = (9 × 10^9 N m²/C²) * (5 × 10^-6 C) / (2 m) = 2250 V.
Correct Answer: B — 2250 V
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Q. What is the electric potential energy of a charge of 1 C at a point where the electric potential is 10 V?
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A.
10 J
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B.
1 J
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C.
0 J
-
D.
100 J
Solution
Electric potential energy U = q * V = 1 C * 10 V = 10 J.
Correct Answer: A — 10 J
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Q. What is the electric potential energy of a charge of 1 C placed in an electric field of 10 N/C at a distance of 2 m?
-
A.
20 J
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B.
10 J
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C.
5 J
-
D.
2 J
Solution
Electric potential energy U = q * V = q * E * d = 1 C * 10 N/C * 2 m = 20 J.
Correct Answer: A — 20 J
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Q. What is the electric potential energy of a charge of 1 μC placed in an electric potential of 200 V?
-
A.
0.2 mJ
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B.
0.1 mJ
-
C.
0.4 mJ
-
D.
0.5 mJ
Solution
Electric potential energy U = q * V = 1 × 10^-6 C * 200 V = 0.2 mJ.
Correct Answer: A — 0.2 mJ
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Q. What is the electric potential energy of a system of two charges +q and -q separated by a distance r?
-
A.
0
-
B.
kq²/r
-
C.
-kq²/r
-
D.
kq/r
Solution
The electric potential energy U = k(q1*q2)/r = k(+q*-q)/r = -kq²/r.
Correct Answer: C — -kq²/r
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Q. What is the electric potential energy of a system of two charges of +2 μC and -2 μC separated by 0.5 m?
-
A.
-72 J
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B.
72 J
-
C.
0 J
-
D.
-36 J
Solution
U = k * (q1 * q2) / r = (9 × 10^9 N m²/C²) * (2 × 10^-6 C * -2 × 10^-6 C) / 0.5 m = -72 J.
Correct Answer: D — -36 J
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Q. What is the electric potential energy of a system of two point charges Q1 and Q2 separated by a distance r?
-
A.
kQ1Q2/r
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B.
kQ1Q2/2r
-
C.
kQ1Q2/r²
-
D.
kQ1Q2
Solution
The electric potential energy U of a system of two point charges is given by U = kQ1Q2/r.
Correct Answer: A — kQ1Q2/r
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Q. What is the electron configuration of Chromium (Cr)?
-
A.
[Ar] 4s2 3d4
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B.
[Ar] 4s1 3d5
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C.
[Ar] 4s2 3d5
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D.
[Ar] 4s2 3d3
Solution
Chromium has an electron configuration of [Ar] 4s1 3d5 due to stability from half-filled d-orbitals.
Correct Answer: B — [Ar] 4s1 3d5
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Q. What is the electron configuration of Magnesium?
-
A.
1s² 2s² 2p⁶ 3s²
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B.
1s² 2s² 2p⁶ 3s² 3p¹
-
C.
1s² 2s² 2p⁶ 3s² 3p²
-
D.
1s² 2s² 2p⁶ 3s² 3d¹
Solution
The electron configuration of Magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer: A — 1s² 2s² 2p⁶ 3s²
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Q. What is the electron configuration of oxygen (O)?
-
A.
1s2 2s2 2p4
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B.
1s2 2s2 2p6
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C.
1s2 2s1 2p5
-
D.
1s2 2s2 2p3
Solution
The electron configuration of oxygen (atomic number 8) is 1s2 2s2 2p4.
Correct Answer: A — 1s2 2s2 2p4
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Q. What is the electron configuration of potassium (K)?
-
A.
1s² 2s² 2p⁶ 3s¹
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B.
1s² 2s² 2p⁶ 3s²
-
C.
1s² 2s² 2p⁶ 3s² 3p¹
-
D.
1s² 2s² 2p⁶ 3s² 3p²
Solution
The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer: A — 1s² 2s² 2p⁶ 3s¹
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Q. What is the electron configuration of the alkali metal potassium (K)?
-
A.
1s² 2s² 2p⁶ 3s¹
-
B.
1s² 2s² 2p⁶ 3s²
-
C.
1s² 2s² 2p⁶ 3s² 3p¹
-
D.
1s² 2s² 2p⁶ 3s² 3p²
Solution
The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer: A — 1s² 2s² 2p⁶ 3s¹
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Q. What is the electron configuration of the alkaline earth metal magnesium?
-
A.
1s² 2s² 2p⁶ 3s²
-
B.
1s² 2s² 2p⁶ 3s² 3p²
-
C.
1s² 2s² 2p⁶ 3s² 3p⁶
-
D.
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
Solution
The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer: A — 1s² 2s² 2p⁶ 3s²
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Q. What is the electron configuration of the element with atomic number 12?
-
A.
1s2 2s2 2p6 3s2
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B.
1s2 2s2 2p6 3s2 3p1
-
C.
1s2 2s2 2p6 3s2 3p6
-
D.
1s2 2s2 2p6 3s2 3d10
Solution
The element with atomic number 12 is Magnesium (Mg) with the configuration 1s2 2s2 2p6 3s2.
Correct Answer: A — 1s2 2s2 2p6 3s2
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Q. What is the electron configuration of the element with atomic number 26?
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A.
1s2 2s2 2p6 3s2 3p6 4s2 3d6
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B.
1s2 2s2 2p6 3s2 3p6 4s2 3d5
-
C.
1s2 2s2 2p6 3s2 3p6 4s2 3d7
-
D.
1s2 2s2 2p6 3s2 3p6 4s2 3d8
Solution
The electron configuration of iron (Fe), which has an atomic number of 26, is 1s2 2s2 2p6 3s2 3p6 4s2 3d6.
Correct Answer: A — 1s2 2s2 2p6 3s2 3p6 4s2 3d6
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Q. What is the electron configuration of the s-block element magnesium?
-
A.
1s² 2s² 2p⁶ 3s²
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B.
1s² 2s² 2p⁶ 3s² 3p¹
-
C.
1s² 2s² 2p⁶ 3s² 3p²
-
D.
1s² 2s² 2p⁶ 3s² 3d¹
Solution
The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer: A — 1s² 2s² 2p⁶ 3s²
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Q. What is the electron pair geometry of NH3?
-
A.
Tetrahedral
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B.
Trigonal planar
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C.
Octahedral
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D.
Linear
Solution
NH3 has four electron pairs (three bonding pairs and one lone pair), giving it a tetrahedral electron pair geometry.
Correct Answer: A — Tetrahedral
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Q. What is the electron pair geometry of SF6?
-
A.
Tetrahedral
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B.
Trigonal bipyramidal
-
C.
Octahedral
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D.
Square planar
Solution
SF6 has six bonding pairs and no lone pairs, resulting in an octahedral electron pair geometry.
Correct Answer: C — Octahedral
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Q. What is the electronic configuration of a chlorine ion (Cl-)?
-
A.
1s2 2s2 2p6 3s2 3p5
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B.
1s2 2s2 2p6
-
C.
1s2 2s2 2p6 3s2 3p6
-
D.
1s2 2s2 2p6 3s2 3p4
Solution
Chlorine ion (Cl-) has gained an electron, resulting in the configuration 1s2 2s2 2p6.
Correct Answer: B — 1s2 2s2 2p6
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Q. What is the electronic configuration of a neutral oxygen atom?
-
A.
1s2 2s2 2p4
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B.
1s2 2s2 2p6
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C.
1s2 2s2 2p2
-
D.
1s2 2s2 2p5
Solution
Oxygen has 8 electrons. The electronic configuration is 1s2 2s2 2p4.
Correct Answer: A — 1s2 2s2 2p4
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Q. What is the electronic configuration of a neutral sodium atom?
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A.
1s2 2s2 2p6 3s1
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B.
1s2 2s2 2p6
-
C.
1s2 2s2 2p5
-
D.
1s2 2s2 2p6 3s2
Solution
Sodium has 11 electrons, and its configuration is 1s2 2s2 2p6 3s1.
Correct Answer: A — 1s2 2s2 2p6 3s1
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Q. What is the electronic configuration of a sodium ion (Na+)?
-
A.
1s2 2s2 2p6
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B.
1s2 2s2 2p6 3s1
-
C.
1s2 2s2 2p5
-
D.
1s2 2s2 2p6 3s2
Solution
Sodium ion (Na+) has lost one electron, resulting in the configuration 1s2 2s2 2p6.
Correct Answer: A — 1s2 2s2 2p6
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Q. What is the electronic configuration of Chlorine?
-
A.
1s2 2s2 2p6 3s2 3p5
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B.
1s2 2s2 2p6 3s2 3p4
-
C.
1s2 2s2 2p6 3s2 3p6
-
D.
1s2 2s2 2p6 3s2 3p3
Solution
Chlorine (Cl) has 17 electrons, so its configuration is 1s2 2s2 2p6 3s2 3p5.
Correct Answer: A — 1s2 2s2 2p6 3s2 3p5
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Q. What is the electronic configuration of Iron?
-
A.
[Ar] 4s2 3d6
-
B.
[Ar] 4s2 3d8
-
C.
[Ar] 4s2 3d5
-
D.
[Ar] 4s2 3d7
Solution
Iron (Fe) has the configuration [Ar] 4s2 3d6.
Correct Answer: A — [Ar] 4s2 3d6
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Q. What is the electronic configuration of oxygen?
-
A.
1s2 2s2 2p4
-
B.
1s2 2s2 2p6
-
C.
1s2 2s2 2p2
-
D.
1s2 2s2 2p5
Solution
Oxygen has 8 electrons, and its electronic configuration is 1s2 2s2 2p4.
Correct Answer: A — 1s2 2s2 2p4
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Q. What is the electronic configuration of the alkali metal potassium (K)?
-
A.
1s² 2s² 2p⁶ 3s¹
-
B.
1s² 2s² 2p⁶ 3s²
-
C.
1s² 2s² 2p⁶ 3s² 3p¹
-
D.
1s² 2s² 2p⁶ 3s² 3p⁶
Solution
The electronic configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer: A — 1s² 2s² 2p⁶ 3s¹
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Q. What is the electronic configuration of the chloride ion (Cl-)?
-
A.
1s2 2s2 2p6 3s2 3p5
-
B.
1s2 2s2 2p6 3s2 3p6
-
C.
1s2 2s2 2p6 3s2 3p4
-
D.
1s2 2s2 2p6 3s2 3p3
Solution
Chloride ion has gained one electron, making its configuration 1s2 2s2 2p6 3s2 3p6.
Correct Answer: B — 1s2 2s2 2p6 3s2 3p6
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Q. What is the electronic configuration of the element with atomic number 104?
-
A.
[Rn] 5f14 6d2
-
B.
[Rn] 5f14 6d4
-
C.
[Rn] 5f14 6d8
-
D.
[Rn] 5f14 7s2
Solution
The electronic configuration of Rutherfordium (atomic number 104) is [Rn] 5f14 6d4.
Correct Answer: B — [Rn] 5f14 6d4
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