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1) At its melting point ice is lighter than water because a) H 2 O molecules are more closely packed in solid state b) Ice crystals have hollow hexagonal arrangement of H 2 O molecules c) On melting of ice the H 2 O molecule shrinks in size d) Ice forms monthly heavy water on first melting



1)      At its melting point ice is lighter than water because


a)      H2O molecules are more closely packed in solid state


b)      Ice crystals have hollow hexagonal arrangement of H2O molecules


c)       On melting of ice the H2O molecule shrinks in size


d)      Ice forms monthly heavy water on first melting


Grade:upto college level

1 Answers

Radhika Batra
247 Points
7 years ago

Ans:       b

Exp:       In the structure of ice each molecule of H2O is surrounded by three H2O molecules in hexagonal honey comb manner. On the other in water, each molecule is surrounded by four neigh bouring molecules randomly which results an open cage like structure. As a result there are a number of ‘hole’ or open spaces. In such a structure lesser number of molecules are packed per ml. When ice melts a large no. of hydrogen bonds are broken. The molecules therefore move into the holes or open spaces and come closer to each other than they were in solid state. This result sharp increase in the density. Therefore ice has lower density than water.

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