True or false: (a) For molecules with similar molecularweights, the dispersion forces become stronger as the moleculesbecome more polarizable. (b) For the noble gasesthe dispersion forces decrease while the boiling pointsincrease as you go down the column in the periodic table.(c) In terms of the total attractive forces for a given substance,dipole–dipole interactions, when present, arealways greater than dispersion forces.(d) All other factorsbeing the same, dispersion forces between linear moleculesare greater than those between molecules whoseshapes are nearly spherical. (e) The larger the atom, themore polarizable it is.

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.