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Question: Answered & Verified by Expert
Assertion (A) $\mathrm{LiCl}$ and $\mathrm{MgCl}_2$ are soluble in ethanol.
Reason (R) Lithium and magnesium are harder than their respective group elements. The correct option among the following is
Chemistrys Block ElementsTS EAMCETTS EAMCET 2021 (06 Aug Shift 1)
Options:
  • A $(A)$ is true, $(R)$ is true and $(R)$ is the correct explanation for $(A)$
  • B $(A)$ is true, $(R)$ is true but $(R)$ is not the correct explanation for $(A)$.
  • C (A) is true but (R) is false.
  • D (A) is false but (R) is true.
Solution:
1437 Upvotes Verified Answer
The correct answer is: $(A)$ is true, $(R)$ is true but $(R)$ is not the correct explanation for $(A)$.
Both Assertion and Reason are true but Reason is not correct explanation of Assertion. Alcohol forms hydrogen bonding and it also has a covalent character, so it is a polar solvent. So, due to polar nature lithium chloride and magnesium chloride are soluble in polar solvent alcohol. Due to diagonal relationship, $\mathrm{Li}$ and $\mathrm{Mg}$ show many similarity in properties like electronegativities, harder weak bases etc. But this is not a correct explanation of their solubility in alcohol.

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