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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
Which substance has the highest melting point?
  • A
    $CO$
  • B
    $CO_2$
  • C
    $SiO_2$
  • D
    $P_2O_5$
✓

Answer

$(c) \,CO, CO_2$ and $P_2O_5$ are covalent compounds having their molecular  lattice. But $SiO_2$ is a covalent compound having $3-$ dimensional  network structure and it has covalent lattice, so $M.P.$ of $SiO_2$ is maximum.

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