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Question

When freezing of a liquid takes place in a system it :
  1. may have q>0 or q<0 depending on the liquid
  2. is represented by q>0
  3. is represented by q<0
  4. has q=0

A
may have q>0 or q<0 depending on the liquid
B
is represented by q<0
C
has q=0
D
is represented by q>0
Solution
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