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 16 of 16
- A. Redox reaction
- B. Acid base reaction
- C. Substitution reaction
- D. Decomposition reaction
Explanation: The reaction is 'decomposition' as one mole of water is removed to form the hydronium ion
Correct answer: Decomposition reaction- A. Ethylene
- B. Acetylene
- C. Benzene
- D. All have equal strength
Explanation: Acetylene (ethyne) has a triple bond between the carbon atoms, allowing it to donate a pair of electrons more readily compared to…
Correct answer: Acetylene- A. Sulphate ion
- B. Hydroxyl ion
- C. Per chlorate ion
- D. Iodide ion
Explanation: The hydroxyl ion (OH-) is a strong conjugate base. It readily accepts a proton (H+) to form water (H2O).
Correct answer: Hydroxyl ion- A. 1 M HF
- B. 1 M HCL
- C. 1 m CH3COOH
- D. 1 M NaOH
Explanation: As we know that lower the pH, stronger the acid and greater the no of hydrogen ions in a solution.
Correct answer: 1 m CH3COOH- A. 3
- B. -3
- C. - antilog [3]
- D. 10^-3
Explanation: pH is defined as the negative logarithm of the hydrogen ion concentration [H+].
Correct answer: 10^-3- A. Mg(OH)2
- B. MgSO4
- C. Ca(OH)2
- D. CaSO4
Explanation: Milk of magnesia is a suspension of magnesium hydroxide, with the chemical formula Mg(OH)2.
Correct answer: Mg(OH)2- A. 0.0001 mol/L
- B. -4
- C. 10-4 mol/L
- D. 10-10
Explanation: To determine the concentration of nitric acid in moles per liter with a pH of 4, we apply the formula: pH = -log[H+].
Correct answer: 0.0001 mol/L- A. 10−5
- B. 5
- C. 10−9
- D. 9
Explanation: As we know that,pH+pOH=14pOH=14-9=5Also, pOH=log[OH-][OH-]=antilog(pOH)[OH]=antilog (5)[OH]=10-5
Correct answer: 10−5- A. H2NCONH2
- B. NH4COONH4
- C. H2NCOONH2
- D. NH2COONH4
Explanation: Ammonium carbamate is a salt formed by the reaction of ammonia with carbon dioxide or carbamic acid.
Correct answer: NH2COONH4- A. Water brings them close
- B. Water helps them in bonding
- C. Water dissolve them in ions
- D. Water reacts with them
Explanation: When substances dissolve in water, they often undergo a process called hydration, where the water molecules surround and separate the…
Correct answer: Water dissolve them in ions- A. [Ag(NH3)2]Cl
- B. [Ag(NH3)]Cl
- C. [Ag(NH3)4]Cl
- D. [Ag(NH3)6]Cl
Explanation: When ammonium hydroxide is added to silver chloride, the silver chloride dissolves in the ammonia to form a diamine complex: [Ag(NH3)2]Cl.
Correct answer: [Ag(NH3)2]Cl- A. NH4Cl
- B. NaNO3
- C. Na2CO3
- D. Na2SO4
Explanation: The correct answer is Na2CO3. Sodium carbonate forms an alkaline solution because it undergoes hydrolysis in water, releasing hydroxide…
Correct answer: Na2CO3313. The compound used in borax bead test for the detection of basic redicals to form colored bead is:
- A. H2BO2
- B. (C2H5)3BO3
- C. Ca2B6O115H2O
- D. Na2B4O710H2O
Explanation: Per one molecule of borax, there are 10 molecules of water of crystallization. Hence, metaborate is formed in the borax bead test.
Correct answer: Na2B4O710H2O- A. Ca(OH)2
- B. SiCl4
- C. KCl
- D. SrCl2
Explanation: KCl is a strong electrolyte because it fully dissociates into ions (K+ and Cl-) in water, allowing efficient conduction of electricity.
Correct answer: KCl