Q15 / 160 · TS EAMCET 2021 (06 Aug Shift 1) · Chemistry

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

  • A
    $(A)$ is true, $(R)$ is true and $(R)$ is the correct explanation for $(A)$
  • Correct answer
    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

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.

Hence, the correct answer is option: 'B'.

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