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The melting point of RbBr is , while that of NaF is
. The principal reason that melting point of NaF is much higher than that of RbBr is that:
Option: 1
The internuclear distance is greater for RbBr than that for NaF
Option: 2
These two crystals are not isomorphous
Option: 3
The bond in RbBr has more covalent character than the bond in NaF
Option: 4
The molar mass of NaF is smaller than that of RbBr
Answers (1)
The internuclear distance is lesser for NaF than RbBr due to which there is a strong electrostatic force of attraction in NaF. Thus, the melting point of NaF is greater than RbBr.
Therefore, Option(1) is correct
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