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Ionic Conductance

The qualitati...

Question

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of $K C l, C H_{3} O H$ and $C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}$ at room temperature. The correct assignment of the sketches is

I : KCl; II :

C H_{3} O H

;
III :

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

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I :

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

;
II :

C H_{3} O H

; III :

K C l

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I :

K C l

;
II :

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

;
III :

C H_{3} O H

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I :

C H_{3} O H

; II :

K C l

;
III :

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

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Solution

The correct option is D I : $C H_{3} O H$ ; II : $K C l$ ;
III : $C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}$
Strong electrolytes like $K C l$ increase the surface tension slightly. Low molar mass organic compounds usually decrease the surface tension. Surface active organic compounds like detergents sharply decrease surface tension

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Similar questions

K C l, C H_{3} O H

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

K C l, C H_{3} O H

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

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C_{6} H_{6},

C H_{3} O H

C_{6} H_{5} N O_{2}

C_{6} H_{5} N H_{2}

80^{o} C

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N a F (s)

N a_{(g)} \to N a_{(g)}^{+} + e^{-}

F_{(g)} + e^{-} \to F_{(g)}^{-}

N a_{(g)}^{+} + F_{(g)}^{-} \to N a F_{(s)}

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