Electrolytic and Metallic Conduction NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Electrolytic and Metallic Conduction MCQ Questions


13.
The limiting molar conductivity of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol⁻¹ respectively. The limiting molar conductivity of CH₃COOH is:
A.
516.9 S cm² mol⁻¹
B.
390.5 S cm² mol⁻¹
C.
299.5 S cm² mol⁻¹
D.
208.6 S cm² mol⁻¹
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ANSWER :
B. 390.5 S cm² mol⁻¹
14.
Which of the following methods is used to determine the limiting molar conductivity of weak electrolytes?
A.
Using Ostwald's dilution law alone
B.
Measurement at very high concentration
C.
Direct extrapolation of Λₘ vs √c plot to c = 0
D.
Kohlrausch's law applied to strong electrolytes
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ANSWER :
D. Kohlrausch's law applied to strong electrolytes
15.
The variation of molar conductivity with √c for a strong electrolyte follows the equation Λₘ = Λ°ₘ − A√c. This equation is known as:
A.
Kohlrausch's law
B.
Debye-Hückel-Onsager equation
C.
Ostwald's dilution law
D.
Faraday's law
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ANSWER :
B. Debye-Hückel-Onsager equation
16.
The degree of dissociation (α) of a weak electrolyte at concentration c is given by:
A.
α = Λ°ₘ/Λₘ
B.
α = Λₘ/Λ°ₘ
C.
α = Λₘ × Λ°ₘ
D.
α = Λₘ + Λ°ₘ
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ANSWER :
B. α = Λₘ/Λ°ₘ
17.
Which of the following ions has the highest ionic conductivity at infinite dilution in aqueous solution at 298 K?
A.
H⁺
B.
Li⁺
C.
K⁺
D.
Na⁺
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ANSWER :
A. H⁺
18.
Among Li⁺, Na⁺, K⁺, and Cs⁺, which has the highest molar ionic conductivity in aqueous solution?
A.
K⁺
B.
Li⁺
C.
Na⁺
D.
Cs⁺
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ANSWER :
D. Cs⁺