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Pick out statement (s) which is/are not ...

Pick out statement (s) which is/are not true about diagonal relationship of Li and Mg:
A. Polarising powers of `Li^(o+)` and `Mg^(2+)` ions are almost the same.
B. Like Li, Mg decomposes water very fast.
C. LiCI and `MgCI_(2)` are deliquesent.
D. Like Li, Mg readily reacts with liquid bromine at ordinary temperaure.

A

A and D

B

B and C

C

Only B

D

B and D

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about the diagonal relationship between lithium (Li) and magnesium (Mg) are not true, we will analyze each statement one by one. ### Step 1: Analyze Statement A **Statement A:** "Polarising powers of `Li^(o+)` and `Mg^(2+)` ions are almost the same." - **Analysis:** The polarizing power of an ion is determined by its charge and size. The charge density (charge/size) of `Li^(o+)` (Li+) and `Mg^(2+)` is indeed similar due to their comparable charge densities, as both ions have a high charge relative to their size. Therefore, this statement is **true**. ### Step 2: Analyze Statement B **Statement B:** "Like Li, Mg decomposes water very fast." - **Analysis:** Lithium is known to react vigorously with water, decomposing it rapidly to form lithium hydroxide and hydrogen gas. However, magnesium does not react with water at room temperature; it requires steam or higher temperatures for significant reaction. Therefore, this statement is **not true**. ### Step 3: Analyze Statement C **Statement C:** "LiCl and `MgCl_(2)` are deliquescent." - **Analysis:** Both lithium chloride (LiCl) and magnesium chloride (MgCl2) are hygroscopic, meaning they can absorb moisture from the air. They can form hydrates and thus are considered deliquescent. Therefore, this statement is **true**. ### Step 4: Analyze Statement D **Statement D:** "Like Li, Mg readily reacts with liquid bromine at ordinary temperature." - **Analysis:** Lithium reacts readily with bromine at room temperature, forming lithium bromide. However, magnesium does not react readily with liquid bromine at ordinary temperatures; it requires higher temperatures to react. Therefore, this statement is **not true**. ### Conclusion The statements that are **not true** about the diagonal relationship of Li and Mg are **B and D**. ### Summary of Findings: - **True Statements:** A, C - **Not True Statements:** B, D ### Final Answer: The statements that are not true are **B and D**. ---
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