JEE Main 2023 — Chemistry Physical Chemistry

2023integereasy

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/ are _____

A. $1M\mathrm{aq}.\mathrm{NaCl}$ and $2M\mathrm{aq}.$ urea

B. $1M\mathrm{aq}.{\mathrm{CaCl}}_{2}$ and $1.5M\mathrm{aq}.\mathrm{KCl}$

C. $1.5M\mathrm{aq}.{\mathrm{AlCl}}_{3}$ and $2M\mathrm{aq}.{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}$

D. $2.5M\mathrm{aq}.\mathrm{KCl}$ and $1M\mathrm{aq}.{\mathrm{Al}}_{2}({\mathrm{SO}}_{4}{)}_{3}$

Official previous-year question

Held on 6 Apr 2023 · Verified 6 Jul 2026.

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Solution

A solution having the same solute and solvent concentration as a cell across the semipermeable membrane is referred to as isotonic solution.

The effective concentration of each solution can be calculated as follows,

Effective concentration $=i({\mathrm{Von}}^{'}t\mathrm{Hoff}\mathrm{factor})\times C$

$1M\mathrm{NaCl}$ has effective concentration $=2\times 1=2M$ and hence it is isotonic with two molar urea solution.

$1M{\mathrm{CaCl}}_{2}$ has effective concentration $=3M\mathrm{and}1.5M\mathrm{KCl}$ has also $3M$ , hence, both are isotonic.

$1.5M{\mathrm{AlCl}}_{3}\cong 6M\mathrm{and}2M{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}\cong 6M$ , Hence both are isotonic.

$2.5M\mathrm{KCl}\cong 5M\mathrm{and}1M{\mathrm{Al}}_{2}{({\mathrm{SO}}_{4})}_{3}\cong 5M$ , Hence both are isotonic.

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Solution

A solution having the same solute and solvent concentration as a cell across the semipermeable membrane is referred to as isotonic solution.

The effective concentration of each solution can be calculated as follows,

Effective concentration $=i({\mathrm{Von}}^{'}t\mathrm{Hoff}\mathrm{factor})\times C$

$1M\mathrm{NaCl}$ has effective concentration $=2\times 1=2M$ and hence it is isotonic with two molar urea solution.

$1M{\mathrm{CaCl}}_{2}$ has effective concentration $=3M\mathrm{and}1.5M\mathrm{KCl}$ has also $3M$ , hence, both are isotonic.

$1.5M{\mathrm{AlCl}}_{3}\cong 6M\mathrm{and}2M{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}\cong 6M$ , Hence both are isotonic.

$2.5M\mathrm{KCl}\cong 5M\mathrm{and}1M{\mathrm{Al}}_{2}{({\mathrm{SO}}_{4})}_{3}\cong 5M$ , Hence both are isotonic.

JEE Main 2023 — Chemistry Physical Chemistry

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JEE Main 2023 — Chemistry Physical Chemistry

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry