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1. Which of the following has maximum bond angle?
a) H₂O
b) CCl₄
c) BF₃
d) NH₃
✅ Correct Answer: (c) BF₃
🔎📌 Short Reason
Among the given molecules, BF₃ has the maximum bond angle (120°) because of its trigonal planar geometry. The others have smaller bond angles due to lone pair repulsion or tetrahedral arrangement.
🔎🧠 Step by Step Reasoning
🔎 (a) H₂O (Water):
🔥 Geometry: Bent (due to 2 lone pairs). Bond angle ≈ 104.5°. ❌
🔎 (b) CCl₄ (Carbon tetrachloride):
🔥 Geometry: Tetrahedral. Bond angle ≈ 109.5°. ❌
🔎 (c) BF₃ (Boron trifluoride):
🔥 Geometry: Trigonal planar. Bond angle ≈ 120°. ✅ 👈
🔎 (d) NH₃ (Ammonia):
🔥 Geometry: Trigonal pyramidal (due to lone pair). Bond angle ≈ 107°. ❌
🔎📌 Short Reason
Among the given molecules, BF₃ has the maximum bond angle (120°) because of its trigonal planar geometry. The others have smaller bond angles due to lone pair repulsion or tetrahedral arrangement.
🔎🧠 Step by Step Reasoning
🔎 (a) H₂O (Water):
🔥 Geometry: Bent (due to 2 lone pairs). Bond angle ≈ 104.5°. ❌
🔎 (b) CCl₄ (Carbon tetrachloride):
🔥 Geometry: Tetrahedral. Bond angle ≈ 109.5°. ❌
🔎 (c) BF₃ (Boron trifluoride):
🔥 Geometry: Trigonal planar. Bond angle ≈ 120°. ✅ 👈
🔎 (d) NH₃ (Ammonia):
🔥 Geometry: Trigonal pyramidal (due to lone pair). Bond angle ≈ 107°. ❌
2. Which of the following aqueous solution of salt is either acidic or basic?
a) NH₄CN
b) CH₃COONH₄
c) AgSH
d) All of these
✅ Correct Answer: (d) All of these
🔎📌 Short Reason
Each of the salts NH₄CN, CH₃COONH₄, and AgSH undergoes hydrolysis in water, producing either acidic or basic solutions. Therefore, the correct option is All of these.
🔎🧠 Step by Step Reasoning
🔎 (a) NH₄CN (Ammonium cyanide):
🔥 Contains NH₄⁺ (weak base conjugate → acidic) and CN⁻ (weak acid conjugate → basic).
🔥 Both ions hydrolyze → solution can be acidic or basic depending on relative strengths. So, not neutral. ✅
🔎 (b) CH₃COONH₄ (Ammonium acetate):
🔥 Contains NH₄⁺ (acidic) and CH₃COO⁻ (basic).
🔥 Both ions hydrolyze → solution may be slightly acidic or basic depending on Ka vs Kb. So, not neutral. ✅
🔎 (c) AgSH (Silver hydrosulfide):
🔥 Contains Ag⁺ (cation of weak base → acidic hydrolysis) and SH⁻ (anion of weak acid → basic hydrolysis).
🔥 Again, solution is not neutral. ✅
👉 Since all three salts undergo hydrolysis and give either acidic or basic solutions, the correct choice is All of these. ✅
🔎📌 Short Reason
Each of the salts NH₄CN, CH₃COONH₄, and AgSH undergoes hydrolysis in water, producing either acidic or basic solutions. Therefore, the correct option is All of these.
🔎🧠 Step by Step Reasoning
🔎 (a) NH₄CN (Ammonium cyanide):
🔥 Contains NH₄⁺ (weak base conjugate → acidic) and CN⁻ (weak acid conjugate → basic).
🔥 Both ions hydrolyze → solution can be acidic or basic depending on relative strengths. So, not neutral. ✅
🔎 (b) CH₃COONH₄ (Ammonium acetate):
🔥 Contains NH₄⁺ (acidic) and CH₃COO⁻ (basic).
🔥 Both ions hydrolyze → solution may be slightly acidic or basic depending on Ka vs Kb. So, not neutral. ✅
🔎 (c) AgSH (Silver hydrosulfide):
🔥 Contains Ag⁺ (cation of weak base → acidic hydrolysis) and SH⁻ (anion of weak acid → basic hydrolysis).
🔥 Again, solution is not neutral. ✅
👉 Since all three salts undergo hydrolysis and give either acidic or basic solutions, the correct choice is All of these. ✅
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