Conductance in Electrolytic Solutions NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Conductance in Electrolytic Solutions MCQ Questions


13.
Which of the following will NOT conduct electricity?
A.
Solid NaCl
B.
Aqueous NaCl
C.
Molten NaCl
D.
Acetic acid in water
πŸ˜‘ View Answer Rough Work Error
ANSWER :
A. Solid NaCl
14.
For a strong electrolyte, the molar conductivity Ξ›β‚˜ varies with concentration c according to Debye-Huckel-Onsager equation as:
A.
Ξ›β‚˜ = Ξ›Β°β‚˜ Γ— √c
B.
Ξ›β‚˜ = Ξ›Β°β‚˜ - A√c
C.
Ξ›β‚˜ = Ξ›Β°β‚˜ + A√c
D.
Ξ›β‚˜ = Ξ›Β°β‚˜ - Ac
πŸ˜‘ View Answer Rough Work Error
ANSWER :
B. Ξ›β‚˜ = Ξ›Β°β‚˜ - A√c
15.
Limiting molar conductivity Ξ›Β°β‚˜ for a weak electrolyte CANNOT be obtained by extrapolation from Ξ›β‚˜ vs √c plot because:
A.
Ξ›β‚˜ for weak electrolytes increases with √c
B.
Weak electrolytes do not give a linear plot
C.
Ξ›Β°β‚˜ for weak electrolytes is zero
D.
The plot does not show steep increase at low concentration regions; Ξ›β‚˜ approaches Ξ›Β°β‚˜ very slowly
πŸ˜‘ View Answer Rough Work Error
ANSWER :
D. The plot does not show steep increase at low concentration regions; Ξ›β‚˜ approaches Ξ›Β°β‚˜ very slowly
16.
Why does molar conductivity of a strong electrolyte decrease slightly with increase in concentration?
A.
Inter-ionic attractions reduce the speed of ions
B.
Number of ions decreases
C.
Degree of dissociation decreases
D.
The electrolyte ionises completely only at very high concentration
πŸ˜‘ View Answer Rough Work Error
ANSWER :
A. Inter-ionic attractions reduce the speed of ions
17.
Why does molar conductivity of a weak electrolyte increase steeply on dilution?
A.
Number of moles of solute increases
B.
Inter-ionic attractions decrease only
C.
Conductivity increases on dilution
D.
Degree of dissociation increases on dilution
πŸ˜‘ View Answer Rough Work Error
ANSWER :
D. Degree of dissociation increases on dilution
18.
Which one of the following statements is correct?
A.
Molar conductivity (Ξ›β‚˜) of a solution decreases with dilution
B.
Both ΞΊ and Ξ›β‚˜ increase with dilution
C.
Conductivity decreases with dilution while molar conductivity increases with dilution
D.
Conductivity (ΞΊ) of a solution increases with dilution
πŸ˜‘ View Answer Rough Work Error
ANSWER :
C. Conductivity decreases with dilution while molar conductivity increases with dilution