Acids, Bases and Salts - Advanced Concepts
Q. What is the role of a buffer solution?
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A.
To change pH rapidly
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B.
To maintain pH stability
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C.
To neutralize acids only
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D.
To neutralize bases only
Solution
A buffer solution maintains pH stability by resisting changes in pH upon the addition of small amounts of acid or base.
Correct Answer: B — To maintain pH stability
Q. Which of the following acids is a strong acid?
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A.
HCl
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B.
HF
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C.
H2CO3
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D.
CH3COOH
Solution
HCl is a strong acid that completely dissociates in water, while HF, H2CO3, and CH3COOH are weak acids.
Correct Answer: A — HCl
Q. Which of the following compounds acts as a Brønsted-Lowry acid?
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A.
NH3
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B.
H2O
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C.
HCl
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D.
NaOH
Solution
HCl acts as a Brønsted-Lowry acid because it donates a proton (H+).
Correct Answer: C — HCl
Q. Which of the following salts is formed from a strong acid and a weak base?
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A.
NaCl
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B.
NH4Cl
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C.
K2SO4
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D.
CaCO3
Solution
NH4Cl is formed from the strong acid HCl and the weak base NH3.
Correct Answer: B — NH4Cl
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