Which of the following has the highest meltin | vedclass

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(A) $SiO_2$ (silica) is a network covalent solid with a giant $3-D$ tetrahedral structure. Due to the presence of strong covalent bonds throughout the

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$SiO_2$

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(A) $SiO_2$ (silica) is a network covalent solid with a giant $3-D$ tetrahedral structure. Due to the presence of strong covalent bonds throughout the entire crystal lattice,it requires a very high amount of energy to break these bonds,resulting in a very high melting point (approximately $1973 \ K$). In contrast,$NaCl$,$Na_2CO_3$,and $NaF$ are ionic compounds which,while having high melting points,are generally lower than that of the network covalent solid $SiO_2$.

Ion	$J^{+}$	$L^{+}$	$M^{2+}$	$X^{-}$	$Y^{-}$	$Z^{2-}$
Radius $(nm)$	$0.14$	$0.18$	$0.15$	$0.14$	$0.18$	$0.15$

Which of the following has the highest melting point?

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