Molar Conductivities and their Variation with Concentration NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Molar Conductivities and their Variation with Concentration MCQ Questions


7.
On dilution, the conductivity (κ) of an electrolytic solution:
A.
Decreases
B.
Remains constant
C.
First increases then decreases
D.
Increases
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ANSWER :
A. Decreases
8.
Limiting molar conductivity (Λm°) refers to molar conductivity at:
A.
Standard concentration of 1 M
B.
Unit concentration
C.
Saturation concentration
D.
Infinite dilution / zero concentration
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ANSWER :
D. Infinite dilution / zero concentration
9.
Kohlrausch's law of independent migration of ions states that:
A.
Conductivity increases linearly with concentration
B.
Λm° of an electrolyte is the sum of contributions of its individual ions
C.
Molar conductivity is independent of temperature
D.
All ions have equal limiting conductivities
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ANSWER :
B. Λm° of an electrolyte is the sum of contributions of its individual ions
10.
According to Kohlrausch's law, the limiting molar conductivity of NaCl is:
A.
λ°(Na⁺) × λ°(Cl⁻)
B.
λ°(Na⁺) + λ°(Cl⁻)
C.
λ°(Na⁺) - λ°(Cl⁻)
D.
[λ°(Na⁺) + λ°(Cl⁻)]/2
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ANSWER :
B. λ°(Na⁺) + λ°(Cl⁻)
11.
For BaCl₂, the limiting molar conductivity according to Kohlrausch's law is:
A.
2λ°(Ba²⁺) + λ°(Cl⁻)
B.
(1/2)λ°(Ba²⁺) + λ°(Cl⁻)
C.
λ°(Ba²⁺) + λ°(Cl⁻)
D.
λ°(Ba²⁺) + 2λ°(Cl⁻)
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ANSWER :
D. λ°(Ba²⁺) + 2λ°(Cl⁻)
12.
For Al₂(SO₄)₃, Λm° equals:
A.
λ°(Al³⁺) + λ°(SO₄²⁻)
B.
2λ°(Al³⁺) + λ°(SO₄²⁻)
C.
3λ°(Al³⁺) + 2λ°(SO₄²⁻)
D.
2λ°(Al³⁺) + 3λ°(SO₄²⁻)
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ANSWER :
D. 2λ°(Al³⁺) + 3λ°(SO₄²⁻)