GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have higher melting points and lower boiling points.
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They have lower melting and boiling points.
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They have lower melting points and higher boiling points.
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They have higher melting and higher boiling points.
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Detailed explanation-1: -The overarching principle involved is simple: the stronger the noncovalent interactions between molecules, the more energy that is required, in the form of heat, to break them apart. Higher melting and boiling points signify stronger noncovalent intermolecular forces.
Detailed explanation-2: -Because intermolecular forces increase the bonding strength between two or more molecules, intermolecular forces can impact the melting and boiling points of compounds. In general, as intermolecular force strength increases, the melting and boiling points of a substance also increase.
Detailed explanation-3: -So, the melting point depends on the energy it takes to overcome the forces between the molecules, or the intermolecular forces, holding them in the lattice. The stronger the intermolecular forces are, the more energy is required, so the higher the melting point is.
Detailed explanation-4: -Substances with high IMF will have higher melting and boiling points. It will require more energy to break the IMF. Most IMF are weaker than chemical bonds. To break the O-H bond in H2O requires 935 kJ/mol.