Assertion :M.P. of BeCl2 is less than that of MgCl2, but reverse in not true for their thermal stability. Reason: M.P. and thermal stability of both compounds depend upon their lattice energy.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is C Assertion is correct but Reason is incorrect Lattice energy of BeCl2 is greater than that of MgCl2. The lattice energies are reflected in the melting points of ionic crystals. M.P. of BeCl2 is less than that of MgCl2, but reverse in not true for their thermal stability.