67. Which isoelectronic ion is the smallest in size? (A) A1³+ (B) Na+ (C) F- (D) 68. Which of these isoelectronic ions is the smallest? (A) 0²- (B) F- (C) Na+ (D) Mg2+ 0²- (E) A13+
67. Which isoelectronic ion is the smallest in size? (A) A1³+ (B) Na+ (C) F- (D) 68. Which of these isoelectronic ions is the smallest? (A) 0²- (B) F- (C) Na+ (D) Mg2+ 0²- (E) A13+
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Electron Affinity
When an element undergoes a chemical reaction, it either gains energy or loses energy. This gain or loss of energy is due to the phenomena that occur at atomic level. During reaction, atoms either gain electrons from other atoms or lose electrons to other atoms, and in that process, energy is produced.
P-Block Elements
Elements which are present on the right side of the periodic table are called p-block elements. In addition to the noble gases, they include the families of boron, mercury, nitrogen, oxygen and fluorine. These elements have diverse real-life implementations that we regularly experience around us.
Metals and Non-metals
The periodic table is composed of metals, semi-metals and nonmetal elements. The physical and chemical properties of metals and nonmetals differ from each other. The study of metals and nonmetals will help one to understand the appropriate application of the particular element.
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I need help with questions 67-68. Could you also explain which option is the correct answer for each question?
Transcribed Image Text:Oxidation & Reduction:
61. Consider the reaction
(A)
(C)
Which statement is true for the reaction?
Fe3+ is oxidized.
Fe3+ is reduced.
62. In the chemical reaction,
(A)
(C)
(B)
(D)
2Fe³+ (aq) + 21 (aq) →2Fe2+(
Na
Cd
H₂
Ag
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s),
metallic zinc is the reducing agent.
copper ion is oxidized.
(A)
Fe3+ increases in oxidation number.
It is reduced.
63. In this reaction, which substance behaves as the oxidizing agent?
Pb + PbO₂ + 2H₂SO4 → 2PbSO4 + 2H₂O
(A) Pb (B) PbSO4 (C) PbO₂ (D) H₂SO4
65. Which is the strongest oxidizing agent?
Standard Reduction Potentials Eº
64. In which group can each substance act as an oxidizing agent?
ACL, MnO Cu (B)Cl,MnO4, Cu²+ (C)CI, MnO4, Cu+
Nat+e¯¯
Cd²+ + 2e
2H+ + 2e-
Ag+ + e
Na+ (B) H₂
2.71 V
0.40 V
0.00 V
-0.80 V
Periodic Properties:
66. The molecule N₂ is isoelectronic with
(A)formaldehyde, CH₂O (B)cyanide ion, CN-
+ (aq) + I₂(aq)
Cdº
67. Which isoelectronic ion is the smallest in size?
(A) A1³+ (B) Na+ (C) F-
Lit ; Li
(B)
(D)
(D)
(D)
Calculate the percentage silver in the coin.
Atomic Molar Masses
Agt
(C)hydrogen, H₂
0²-
metallic zinc in reduced.
sulfate ion is the oxidizing agent.
68. Which of these isoelectronic ions is the smallest?
(E) A13+
(A) 0²- (B) F- (C) Na+ (D) Mg2+
69. In which pair of particles is the first member larger than the second member?
(A) Li+; Be2+
(B)
(C) Lit; Na+
(D)
Be; Mg
70. Which ion has the largest radius?
(A) CI- (B) F-
(C)
K+ (D) Ca²+
O
16.0 g.mol-1
X₂0 (B) XO₂ (C) X₂03 (D) XO4
Stoichiometry:
71. The atomic molar mass of a hypothetical element X is 100 u. It is found that the 50.0 g of X
combines with 32.0 g of oxygen. What is the simplest formula for the oxide of X?
Atomic Molar Mass
(D)Cl2, Mn, Cu²+
(D)water, H₂O
(A)
72. An amino acid has a molar mass of 776.9 g mol-¹ and contains 65.34% iodine by mass. What is the
number of iodine atoms per molecule of amino acid?
(A) one (B) three (C) four (D) five
73. A 6.80 g coin was dissolved in nitric acid and 6.21 g of AgCl was precipitated by the addition of
excess sodium chloride,
Ag+ (aq) + Cl(aq) → AgCl(s)
Ag
108. g.mol-1
Cl
35.5 g.mol-¹
(A) 24.7% (B) 68.7% (C) 75.3% (D) 91.3
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