Identify the correct statement from the following:
I. Quartz is a piezoelectric material.
II. All group 14 tetrachlorides except 
are easily hydrolysed by water.
III. The 
bond distance within the layer of graphite is 
.
IV. 
is soluble in aqueous 
solution.
Text Solution
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Statement I: Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of 
. Some types of quartz crystals have piezoelectric properties.
Statement II: All group 14 tetrachloride except 
are easily hydrolysed by water. It is because of nonavailability of vacant 
-orbitals and steric crowding due to presence of four 
-atoms around 
-atom which do not allow water molecule to approach antibonding orbitals of 
bonds.
Statement III: In graphite, the 
bond distance within the layer of graphitc is 
.
Statement IV: 
is insoluble in aqueous 
solution.
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