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Consider the following statements 1. C...

Consider the following statements
1. `Cs^+` ion is more highly hydrated than other alkali metal ions
2. Among the alkali metals Li, Na , K and Rb, Lithium (Li) has the highest melting point
3. Among the alkali metals , only lithium form a stable nitride by direct combination .
O these statements

A

1,2 and 3 are correct

B

1 and 2 are correct

C

1 and 3 are correct

D

2 and 3 correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we will analyze each statement regarding the properties of alkali metal ions and their behavior: ### Step-by-Step Solution: 1. **Analyzing Statement 1:** - The statement claims that the `Cs^+` ion is more highly hydrated than other alkali metal ions. - Hydration refers to the process where water molecules surround and interact with ions. The extent of hydration is influenced by the size of the ion; smaller ions can attract more water molecules due to their higher charge density. - As we move down the alkali metal group (from Li to Cs), the size of the ions increases. Therefore, `Cs^+`, being the largest, will have the least hydration compared to smaller ions like `Li^+`. - **Conclusion:** This statement is **false**. 2. **Analyzing Statement 2:** - The statement asserts that among the alkali metals Li, Na, K, and Rb, lithium (Li) has the highest melting point. - The melting point of alkali metals generally decreases as we move down the group due to the increase in atomic size and decrease in ionization energy. - Lithium, being the smallest alkali metal, has a higher melting point compared to Na, K, and Rb. - **Conclusion:** This statement is **true**. 3. **Analyzing Statement 3:** - The statement indicates that among alkali metals, only lithium forms a stable nitride by direct combination. - Lithium can react with nitrogen to form lithium nitride (Li3N), which is stable. Other alkali metals do not form stable nitrides under normal conditions. - **Conclusion:** This statement is **true**. ### Final Evaluation: - Based on the analysis: - Statement 1: **False** - Statement 2: **True** - Statement 3: **True** Thus, the correct statements are **2 and 3**.
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