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 15 of 16
- A. NaHCO3
- B. NaCO3
- C. Na2CO3
- D. Ca(OH)2
Explanation: The explanation for this question will be added soon.
Correct answer: Na2CO3- A. CH3 NH3 Cl
- B. CH3 O- Na+
- C. C6H5 O-Na+
- D. C6H5NH2
- E. H2NCH2CO2H
Explanation: The sodium salt of phenol, which is weakly acidic. When dissolved in water, it would give a weakly alkaline solution due to the hydrolysis…
Correct answer: C6H5 O-Na+- A. Hydration
- B. Hydrolysis
- C. Preventing of rapid hardening
- D. All of the above options are correct
Explanation: During the grinding there is added about 2% of gypsum which prevents the cement from hardening too rapidly.The addition of gypsum…
Correct answer: Preventing of rapid hardening- 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. Soft drinks
- B. Bananas
- C. Milk of magnesia
- D. Sea water
Explanation: The basic pH of milk of magnesia helps neutralize overactive stomach acids that cause heartburn.
Correct answer: Milk of magnesia- A. 13
- B. 15
- C. 1.3
- D. 0.1
Explanation: A, B and D are incorrect because these are not correct percentage ionization valuesC is correct since The solution is given as CH3COOH…
Correct answer: 1.3- A. 6.7 - 8
- B. 7.9
- C. 7.5
- D. 7.35 - 7.4
Explanation: The pH of human blood is typically around 7.35 to 7.45, which is slightly alkaline or basic.
Correct answer: 7.35 - 7.4- 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: H2CO3295. 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+- A. (CH3)3N
- B. PH3
- C. BF3
- D. O2
Explanation: The correct answer is BF3 because it is an electron-deficient molecule with the ability to accept electron pairs, making it a Lewis acid.
Correct answer: BF3- A. ROH> H2O> C6H5OH>RCOOH
- B. C6H5OH > H2O> ROH > RCOOH
- C. RCOOH > C6H5OH > H2O > ROH
- D. RCOOH > ROH > C6H5OH > H2O
Explanation: The increasing strength of acidities is as follows; carboxylic acids, phenols, water and then ethanol.
Correct answer: RCOOH > C6H5OH > H2O > ROH- A. A catalyst
- B. A Lewis acid
- C. An electron deficient specie
- D. All of the above
Explanation: AlBr3 is used as a catalyst, it is a lewis acid i.e is an electron-pair acceptor therefore it is also an electron deficient species so…
Correct answer: All of the above