1- An example of a strong acid solution is nitric acid.
Which statement is correct for this solution?
- It is completely ionized in water
- It exists mainly as undissociated molecules in solution
- The solution reacts only with weak bases
- The solution has a pH value greater than 7
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2- Which of the following statements concerning acids and bases is not true?
- The product of the [H⁺] and [OH⁻] in a solution at a particular temperature is constant
- The concentration of hydroxide ions is high in a very acidic solution
- At 298 K, a neutral solution has a pH equal to 7
- An increase of pH by 3 units gives a decrease of [H⁺] by 1000
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3- Which of the following is correct?
- A weak acid is a proton donor and it has good conductivity in solution
- A weak acid is a proton donor and it has poor conductivity in solution
- A weak acid is a proton acceptor and it has good conductivity in solution
- A weak acid is a proton acceptor and it has poor conductivity in solution
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4- Which statement about a strong acid and its conjugate base is correct?
- The stronger the acid, the stronger its conjugate base
- The stronger the acid, the less concentrated the conjugate base
- The stronger the acid, the weaker its conjugate base
- The stronger the acid, the more concentrated its conjugate base.
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5- A reaction produces carbon dioxide gas and a solution of water with a dissolved salt. What could be the reactants?
- Sulphuric acid and ammonia
- Ethanoic acid and sodium carbonate
- Nitric acid and magnesium hydroxide
- Hydrochloric acid and calcium metal
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6- Which of the following acids dissociates completely in water?
I. HCl
II. H₂CO₃
III. HNO₃
- I only
- I and III only
- II and III only
- I, II, and III
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7- What are the correct products of the reaction of nitric acid and magnesium metal?
- MgNO₃ and H₂O
- MgNO₃ and H₂
- Mg(NO₃)₂ and H₂O
- Mg(NO₃)₂ and H₂
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8- In order to prepare a solution of 0.1 mol dm⁻³ with the highest pH, substance X is dissolved in water.
Substance X is:
- HCl
- NaOH
- H₂SO₄
- NaCl
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9- Which statement is true for the phosphoric H₃PO₄ and nitric HNO₃ acids?
- Both acids ionize completely when dissolved in water
- The conjugate base of phosphoric acid is a stronger base than the conjugate base of nitric acid
- Phosphoric acid is a better electrolyte than nitric acid
- The conjugate base of nitric acid has a better conductivity in solution than the conjugate base of phosphoric acid
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10- When wine is exposed to air, the ethanol is slowly converted to ethanoic acid. The pH of a bottle of wine changes from 6.5 to 4.5. The concentration of [H⁺] is?
- Decreased by 100
- Decreased by 3
- Increased by 3
- Increased by 100
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A molecule of HBr reacts with water to produce the charged molecule X. What is the Lewis structure of molecule X?
A. H₂O — oxygen has 2 lone pairs, bonded to 2 H atoms, no charge (neutral water)
B. H₃O⁺ — oxygen has 1 lone pair, bonded to 3 H atoms, positive charge (hydronium ion)
C. OH⁻ — oxygen has 3 lone pairs, bonded to 1 H atom, negative charge (hydroxide ion)
D. H₂O⁺ — oxygen has 2 lone pairs, bonded to 2 H atoms, positive charge
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14- Which product is formed when ethanoic acid reacts with magnesium?
- carbon dioxide
- water
- magnesium ethanoate
- magnesium oxide
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15- Which one of the following statements about acids is/ are true?
I Acids will neutralize bases to form salts
II. Acids produce solutions with pH greater than 7
III. Acids ionize to form H⁺ ions when dissolved in water
- I, II and III
- I and II only
- I and III only
- I only
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16- A solution of 1.0 mol dm⁻³ HCl is diluted to 0.1 mol dm⁻³.
Which statement is correct?
- The pH increases by a factor of 10
- The pH decreases by a factor of 10
- The pH increases by 1
- The pH decreases by 1
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17- Which acid(s) fully dissociate(s) in water?
I. H₂CO₃
II. HI
III. CH₃CH₂COOH
- None
- I and II only
- II only
- II and III only
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18- What is correct about a reaction between nitric acid and potassium carbonate?
I. It is exothermic
II. It produces carbon dioxide gas
III. It produces KNO₃
- I and II only
- I and III only
- II and III only
- I, II and III
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Proton transfer reactions paper 1