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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
The melting point of $AlF_3$ is $104\,^oC$ and that of $SiF_4$ is $- 77\,^oC$ (it  sublimes) because 
  • A
    there is a very large difference in the ionic character of the $Al - F$ and $Si - F$  bond
  • B
    in $AlF_3 , Al^{3+}$ interacts very strongly with the neighbouring $F^-$  ions to  given a three dimensional structure but in $SiF_4$ no such interaction is possible 
  • C
    The silicon ion in the tetrahedral $SiF_4$ molecule is not shielded effectively from  the fluoride ions whereas in $AlF_3$ , the $Al^{3+}$ ion is shielded on all sides
  • D
    the attractive forces between the $SiF_4$ molecules are strong whereas those  between the $AlF_3$ molecule are weak
✓

Answer

b$A l F_3$ is ionic in nature while $SiF _4$ is covalent in nature. So, $A l F_3$ has high melting point than $SiF _4$

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