Given the following options, which has the highest melting point?

Question

#"A. Calcium oxide;"#
#"B. water;"#
#"C. oxygen gas;"#
#"D. phosphorus pentoxide."#

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Answer 1 · 2017-12-13T19:23:07

#"Well it is option A."#

You gots calcium oxide, #CaO#, a non-molecular material composed of #Ca^(2+)# and #O^(2-)# ions.

#B.# #"the water molecule,"# #H-O-H#, the which, for its size, is very high melting and boiling due to intermolecular hydrogen bonding.

#C.# #"the dioxygen molecule,"# #O=O#, a room temperature gas.

#D.# #P_2O_5# or rather #P_4O_10#, this is another molecular material.

Non-molecular calcium oxide wins handily...