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# Give the order of melting points $CaO,FeC{l_2},FeC{l_3}$.

Last updated date: 13th Jun 2024
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Hint: Softening point (mp): The temperature (or all the more usually temperature range) at which a substance goes through a strong to fluid stage change (i.e., it liquefies) without an expansion in temperature. Then again, the temperature at which a substance exists in harmony between its strong and fluid stages.

$FeC{l_2} < CaO < FeC{l_3}$
For example, on the off chance that the softening point depended absolutely on electronegativity, at that point truly, $N{a_2}O$ would have a higher dissolving point. Yet, it's something other than that. Dissolving point is likewise a factor of particle size. In the two cases, the ${O^{2 - }}$ particle is a similar size. Be that as it may, the Mg (2+) particle is much more modest than the Na+ particle. Therefore, the $MgO$ structure is more firmly pressed than the $N{a_2}O$ structure. Sodium's ionic sweep is 1.02 Angstroms while Magnesium's is 0.72 Angstroms.
Note: Offer with the kids that the temperature at which ice liquefies is known as the softening point. The dissolving point is the temperature at which a strong goes to a fluid. The dissolving point where ice — a strong — goes to water — a fluid — is $32^\circ F{\text{ }}\left( {0^\circ C} \right)$.