MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryHydrogenPrevious Year Questions
At its melting point, ice is lighter than water because (AIPMT 1992)
A.H2O molecules are more closely packed in solid
B.ice crystals have hollow hexagonal arrangement of✓ Correct
C.on melting of ice, the H2O molecules shrinks in size
D.ice forms mostly heavy water on first melting.
Explanation
In ice crystals, water molecules are linked through H- bonds in hollow hexagonal arrangement. So, volume is large, and density is less. In liquid state this hollow arrangement breaks into closer arrangement of molecules. Consequently, the density is increased in liquid state.