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Q.

Select the correct statement.

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a

Melting  point of quartz glass is sharp but of quartz is not

b

Salt has long range order of constituents but ice does not 

c

Heat of fusion is definite for iron but not for rubber 

d

Glass can give two pieces with plain and smooth surfaces when cut with a sharp edged tool

answer is C.

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Detailed Solution

Quartz glass being amorphous solid does not have sharp melting point but quartz being crystalline solid have sharp melting point. Salt and ice both have long range order of arrangement of constituent particles.
Glass gives two pieces having irregular surface when cut with sharp edged tool.

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Select the correct statement.