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JEE Main levelSingle correct optionDifficulty 2 of 3sb141

Which of the following carbonates is the least soluble in water at 298 K?

A $Na X_{2} CO X_{3}$
B $Li X_{2} CO X_{3}$
C $K X_{2} CO X_{3}$
D $Rb X_{2} CO X_{3}$

Answer: B

The carbonates of Na, K and Rb are very soluble.

Li X_{2} CO X_{3}

is only sparingly soluble because of its high lattice enthalpy, which is not offset by the hydration enthalpy of the small

Li X^{+}

ion.

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