JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Redox Reactions and Electrochemistry

Amongst the following, the form of water with the lowest ionic conductance at 298 K is :

(A)sea water
(B)distilled water✓ Correct
(C)saline water used for intravenous injection
(D)water from a well

Answer: (B)

Solution

Ionic conductance is carried by dissolved ions, so the purer the water the fewer charge carriers it holds and the lower its conductance. Sea water, the saline fluid used for injections, and well water all carry substantial dissolved salts, whereas distilled water has had its ionic content removed during purification. Distilled water therefore shows the lowest ionic conductance at

298 K

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Single correct option

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