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JEE Main levelSingle correct optionDifficulty 2 of 3el239

The compound shown is dissolved in water containing Ca2+ ions. What is observed?

ACalcium metal is deposited
BA gas is evolved
CThe solution stays clear and foams better
DA white scum of an insoluble calcium salt forms

Answer: D

The compound shown is sodium stearate, a soap. With Ca2+ (hard water) it gives insoluble calcium stearate,

2 C X_{17} H X_{35} COO X^{-} + Ca X^{2 +} (C X_{17} H X_{35} COO) X_{2} Ca

, seen as scum. No gas or metal forms.

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