Free Bronsted-Lowry and Lewis Concepts MCQs with Answers
26 Bronsted-Lowry and Lewis Concepts MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The Brønsted-Lowry concept defines acids as proton donors and bases as proton acceptors, producing conjugate acid-base pairs. The Lewis concept extends the idea to electron-pair acceptors and donors, so compounds such as BF3 and NH3 can be treated as acid and base even without proton transfer, unlike the Arrhenius definition.
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- A. 10-4
- B. 10-8
- C. 10-6
- D. 10-10
Explanation: As we know that Ka x Kb = KwKw = 10-14Ka = 10-610-6 x Kb = 10-14Kb = 10-14 / 10-6Kb = 10-14 - (-6)Kb = 10-8
Correct answer: 10-8- 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 rapidly8. 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. HCL and HN03.
- B. H3P04.
- C. Both A and B
- D. Both HCI and 2COOH.
Explanation: Concentrated sulphuric acid has a high boiling point (356°C). So, it is considered to be non-volatile.
Correct answer: HCL and HN03.- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Explanation:During protonation, the double bond between the carbon and oxygen is broken.
Correct answer: Option B- A. Acid
- B. Base
- C. Amphoteric
- D. Neutral
Explanation: Acids are substances that release hydrogen ions (H+) when dissolved in water.
Correct answer: Acid- A. H2SO4(aq) + H2O(l) --> H+ + SO42-
- B. H2SO4(aq) + H2O(l) --> H+(aq) + HSO4-
- C. H2SO4(aq) + H2O(l) --> 2H+ + SO42-
- D. H2SO4(aq) + H2O(l) --> H3O+ + SO42-
Explanation: The 1st ionisation equation involves dissociation of 1 H+ ion from H2SO4, followed by second H+ dissociation in the second ionisation.
Correct answer: H2SO4(aq) + H2O(l) --> H+(aq) + HSO4-- A. Acetic acid
- B. Carbonic acid
- C. Lactic acid
- D. Formic acid
Explanation: The weak acid formed when CO2 reacts with water in fizzy drinks is called "Carbonic acid." Therefore, the correct option is "Carbonic…
Correct answer: Carbonic acid- A. HClO
- B. HClO2
- C. HClO3
- D. HClO4
Explanation: HClO4 (perchloric acid): This acid is the strongest among the options. It is a highly corrosive and reactive acid.
Correct answer: HClO4- A. Base
- B. Acid
- C. Salt
- D. Basic anhydride
Explanation: Metallic oxides that are basic will react with water to form a basic solution.
Correct answer: Base- A. CH3CO2H (aq)
- B. HOCl (aq)
- C. HCHO2
- D. H2CO3
Explanation: H2CO3 is a polyprotic acid. It can donate two protons in separate dissociation reactions: H2CO3 ←→ H+ + HCO3- HCO3- ←→ H+ + CO32- These…
Correct answer: H2CO318. A nucleophile is
- A. Lewis acid
- B. Bronsted acid
- C. Bronsted base
- D. Lewis base
Explanation: A nucleophile is a chemical species that donates an electron pair to form a new chemical bond.
Correct answer: Lewis base- A. HCO-
- B. CN-
- C. NO3-
- D. PO4-
Explanation: The HCO- ion can act as a Bronsted acid by donating a proton to a water molecule, forming H2CO3.
Correct answer: HCO-- A. CN-
- B. NH3
- C. CH3 - O - CH3
- D. I+
Explanation: The correct answer is I+. A Lewis acid is defined as an electron pair acceptor, and I+ fits this definition because of its positive charge…
Correct answer: I+Bronsted-Lowry and Lewis Concepts MCQs: common questions
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