Editing Openai/6946f4fa-e8bc-800b-b77e-c62f6390a97c (section)

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===== EN =====
Which of the following has the greatest bond strength?

中
下列哪一個物種具有最大的鍵強度？

a. B₂
b. O₂⁻
c. CN⁻
d. O₂⁺
e. NO⁻

===== : =====

===== 依 MO 理論計算各物種鍵階： =====

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鍵階最大者 → 鍵最強。

===== ✅ c. CN⁻ =====

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EN
Consider the molecular orbital energy level diagrams for O₂ and NO.
Which of the following statements is (are) correct?

中
考慮 O₂ 與 NO 的分子軌域能階圖，下列哪些敘述正確？

I. Both molecules are paramagnetic.
II. O₂ has a stronger bond than NO.
III. NO is a homonuclear diatomic molecule.
IV. The ionization energy of NO is less than that of NO⁺.

===== - I ✔ O₂（2 個未成對電子）、NO（1 個）→ 皆順磁 =====
* II ✘ NO 鍵階 2.5 > O₂ 鍵階 2
* III ✘ NO 為異核分子
* IV ✔ NO⁺ 更難再失電子 → IE 較大

===== ✅ c. I and IV =====

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EN
How many σ bonds are present in the molecule shown?

中
圖示分子中共有幾個 σ 鍵？

===== 判斷原則： =====
* 單鍵 = 1 σ
* 雙鍵 = 1 σ + 1 π
* 三鍵 = 1 σ + 2 π

逐鍵計算所有鍵中的 σ 部分。

===== ✅ c =====

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EN
How many lone pairs of electrons are present in the molecule shown?

中
該分子中共有幾對孤電子對？

===== 步驟： =====
# 找出各原子的價電子數
# 扣除成鍵電子
# 剩下即為孤對

===== ✅ b =====

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EN
How many atoms in the molecule are sp hybridized?

中
該分子中有幾個原子為 sp 混成？

===== - sp 混成： - 2 電子域 - 線形 - 常見於三鍵或兩個雙鍵 =====

===== 找出： =====
* C≡C
* C≡N
* 或 O=C=O 型結構

===== ✅ a =====

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EN
Which of the following statements is (are) incorrect?

中
下列哪些敘述是錯誤的？

（BF₃、XeF₄、N₂、HCN）

===== 逐條判斷： =====
* BF₃：sp² ✔
* XeF₄：非極性 ✔
* N₂：鍵階 3 ✔
* HCN：2 σ + 2 π ✔

===== ✅ a. All four statements are correct =====

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EN
Which molecule contains the shortest carbon–carbon bond?

中
哪一個分子具有最短的 C–C 鍵？

a. C₂H₂
b. C₂H₄
c. C₂H₆
d. C₂Cl₄
e. b and d

===== - C≡C（三鍵）最短 =====
* 僅 C₂H₂ 為三鍵

===== ✅ a. C₂H₂ =====

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EN
What is the bond order of He₂⁺?

中
He₂⁺ 的鍵階為多少？

===== - He₂⁺：3 電子 =====
'' σ1s²、σ''1s¹

BO=2−12=0.5\text{BO} = \frac{2 - 1}{2} = 0.5BO=22−1=0.5

===== ✅ b. 0.5 =====

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EN
When comparing Be₂ and H₂, which statements are correct?

中
比較 Be₂ 與 H₂，下列哪些敘述正確？

===== - H₂：鍵階 = 1，穩定 =====
* Be₂：鍵階 = 0，不穩定

正確敘述為：
* II（H₂ 鍵階較高）
* III（H₂ 較穩定）

===== ✅ c. II and III =====

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EN
Order the following from shortest to longest bond:
C₂, B₂, H₂, N₂

中
請將下列分子依鍵長由短到長排列。

===== 鍵階比較： =====

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===== ✅ b. N₂ < C₂ < B₂ < H₂ =====