Indicate the correct statements:

Moderate

A

Conductivity cells have cell constant values independent of the solution filled into the cell
B

DC (direct current) is not used for measuring the resistance of a solution.
C

Kohlrausch law in valid both for strong and weak electrolytes.
D

The k decreases but $λ_{M} and λ_{E}$ increase on dilution.

Solution

$Cell constant = \frac{ℓ}{A} = σ$
$κ = G σ λ_{M} = \frac{1000 K}{M}, λ_{N} \frac{1000 K}{N}$
On dilution $G ↓ K ↓ M ↓ N ↓ λ_{M} ↑, λ_{N} ↑$

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