Question:
Which of the following statements are correct?
I. Liquid sodium metal is used as coolant in fast breeder nuclear reactor
II. LiCl is deliquescent
III. LiF and CsI have low solubility in water
Which of the following statements are correct?
I. Liquid sodium metal is used as coolant in fast breeder nuclear reactor
II. LiCl is deliquescent
III. LiF and CsI have low solubility in water
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Li compounds often behave differently because lithium ion is very small and highly polarizing.
Updated On: Jun 15, 2026
- I, III only
- II, III only
- I, II only
- I, II, III
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The Correct Option is D
Solution and Explanation
Concept:
Alkali metal compounds show characteristic physical and chemical properties depending on ionic size and lattice energy.
We test each statement independently.
Step 1: Examine statement I. Liquid sodium has excellent thermal conductivity. It transfers heat effectively. Therefore in fast breeder nuclear reactors sodium is used as coolant. Statement I correct.
Step 2: Examine statement II. Lithium chloride strongly absorbs moisture from atmosphere. Substance which absorbs moisture and dissolves is called deliquescent. Hence \[ LiCl \] is deliquescent. Statement II correct.
Step 3: Examine statement III. Solubility depends on balance between lattice energy and hydration energy. Lithium fluoride has high lattice energy due to very small ions. Caesium iodide has low hydration energy because ions are large. Both show comparatively low solubility. Hence statement III correct. Thus all three statements are correct. \[ \boxed{I,II,III} \]
Step 1: Examine statement I. Liquid sodium has excellent thermal conductivity. It transfers heat effectively. Therefore in fast breeder nuclear reactors sodium is used as coolant. Statement I correct.
Step 2: Examine statement II. Lithium chloride strongly absorbs moisture from atmosphere. Substance which absorbs moisture and dissolves is called deliquescent. Hence \[ LiCl \] is deliquescent. Statement II correct.
Step 3: Examine statement III. Solubility depends on balance between lattice energy and hydration energy. Lithium fluoride has high lattice energy due to very small ions. Caesium iodide has low hydration energy because ions are large. Both show comparatively low solubility. Hence statement III correct. Thus all three statements are correct. \[ \boxed{I,II,III} \]
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