In which are the ionic solids ranked in order of increasing melting point?

(a) kbr < nacl < naf < mgo

(b) naf < nacl < mgo < kbr

(c) kbr < nacl < mgo < naf

(d) mgo < naf < kbr < nacl

(A) KBr < NaCl < NaF < MgO

Explanation:

The melting point of ionic solids is mainly affected by two factors:

i) The charge of the ions: The higher the charge, the higher the melting point. For example, CaX₂ would have a higher melting point than NaX, because Ca⁺² has a higher charge than Na.

ii) The size of the ions: The smaller the ionic radius, the higher the melting point.

With that information in mind the answer is A).

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