73.6k views
5 votes
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

1 Answer

4 votes

Answer:

(A) KBr < NaCl < NaF < MgO

Step-by-step 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).

User Zenocon
by
8.4k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.