Free Acids, Bases and Salts MCQs with Answers
314 Acids, Bases and Salts MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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Read the Acids, Bases and Salts notesFree MDCAT chapter notes with key terms314 questions · page 14 of 16
- A. H3PO3 is dibasic and reducing
- B. H3PO3 is tribasic and reducing
- C. H3PO3 is tribasic and non-reducing
- D. H3PO3 is dibasic and non-reducing
Explanation: In the structure of H3PO3, two -OH groups are present, so it is dibasic acid.
Correct answer: H3PO3 is dibasic and reducing- A. pH = pKa + log[ Acid/Base ]
- B. pH = pKa - log[ Acid/Base ]
- C. pH = pKa - log[ Base/Acid ]
- D. pH = pKa + log[ Base]
Explanation: The Henderson-Hasselbalch equation relates pKa and pH. However, it is only an approximation and should not be used for concentrated…
Correct answer: pH = pKa - log[ Acid/Base ]- A. NH4+
- B. NH
- C. NH2
- D. NH2-
- E. NH3
Explanation: NH₄⁺: This is the conjugated acid of NH₃ (ammonia). When NH₃ accepts a proton (H⁺), it forms NH₄⁺.
Correct answer: NH4+- A. NO3-
- B. Cl-
- C. SO42-
- D. CH3COO-
Explanation: The strength of a conjugate base is inversely related to the strength of its conjugate acid.
Correct answer: CH3COO-- A. An electron pair
- B. A proton
- C. An electron
- D. Pair of protons
Explanation: The correct answer is that an acid is a substance which accepts an electron pair, according to the Lewis concept.
Correct answer: An electron pair- A. FeCl₃
- B. AlCl₃
- C. BF3
- D. All of these
Explanation: The correct answer is All of these because all the compounds listed (FeCl₃, AlCl₃, and BF3) are Lewis acids.
Correct answer: All of these- A. NH₃
- B. PH₃
- C. RNH₂
- D. R₂NH
Explanation: The correct answer is R₂NH because secondary amines (R₂NH) are generally stronger bases than primary amines (RNH₂) and ammonia (NH₃).
Correct answer: R₂NH268. The pH of milk is
- A. 5.0
- B. 6.0
- C. 6.2
- D. 6.5
Explanation: The correct pH of milk is around 6.5, indicating it is slightly acidic.
Correct answer: 6.5- A. CN-
- B. SO4-2
- C. CHO3-
- D. PO4-3
Explanation: CHO3- can act as a Bronsted acid and a Bronsted base. A Bronsted acid is a species that donates a proton (H+), while a Bronsted base is a…
Correct answer: CHO3-- A. An electron pair
- B. Proton
- C. An electron
- D. Pair of proton
Explanation: By Bronsted-Lowery concecpt an acid is a substance which lose a proton.
Correct answer: An electron pair- A. NH4+
- B. H2O
- C. H+
- D. NH3
Explanation: A conjugate acid, within the Brønsted-Lowry acid-base theory, is a chemical compound formed when an acid donates a proton to a base-in…
Correct answer: H2O- A. NH4+
- B. NH4Cl
- C. HCl fumes
- D. Cl
Explanation: b) NH4Cl:NH4Cl is the correct chemical formula for ammonium chloride. When NH3 gas reacts with HCl gas, it forms ammonium chloride…
Correct answer: NH4Cl- A. It acts both as an acid and a base
- B. It can dissolve both acids and bases
- C. It can give off H+ and OH- ions
- D. In its pure form, it has pH=7
- E. Both A and C
Explanation: Explanation for this question will be added soon.
Correct answer: Both A and C- A. HCL:H2SO4
- B. HCL:HNO3
- C. HNO3:H2SO4
- D. HNO3:HCL
Explanation: The explanation for this question will be added soon.
Correct answer: HCL:HNO3- A. Oxidizing
- B. Reducing
- C. Chelating
- D. Chemical
Explanation: The explanation for this question will be added soon.
Correct answer: Chelating- A. Slowly
- B. Do not ionize
- C. Ionize rapidly
- D. None of these
Explanation: An electrolyte is a medium containing ions that is electrically conducting through the movement of ions so the strong electrolytes are…
Correct answer: Ionize rapidly277. The species which donates electrons to the central metal atom in the coordination sphere is called?
- A. Anion
- B. Cation
- C. The ligand is positively charged
- D. Acid
Explanation: Ligands are ions or neutral molecules that bond to a central metal atom or ion.
Correct answer: The ligand is positively charged- A. Br-
- B. CH4
- C. NH3
- D. H2O
Explanation: An electrophile is a species that lack electrons or has a positive charge on it. Br- is a nucleophile, along with H2O and NH3.
Correct answer: CH4- A. 0.1, 0.2
- B. 0.1, 0.3
- C. 0.2, 0.4
- D. 0.2, 0.1
Explanation: 9.8 grams of sulphuric acid is 0.1 moles so there will be 0.2 moles of hydrogen ions ( two hydrogens per sulphuric acid molecule) H2SO4…
Correct answer: 0.2, 0.1280. NaHSO4 is a _ salt
- A. Normal
- B. Acidic
- C. Basic
- D. Amphoteric
Explanation: The explanation for this question will be added soon.
Correct answer: Acidic