Chemistry-
General
Easy

Question

What are the signs of the entropy change (+ or - ) in the following:
I) A liquid crystallises into a solid
II) Temperature of a crystalline solid is raised from 0 K to 115 K
III) 2 NaHCO subscript 3 left parenthesis straight s right parenthesis not stretchy rightwards arrow Na subscript 2 CO subscript 3 left parenthesis straight s right parenthesis not stretchy rightwards arrow Na subscript 2 CO subscript 3 left parenthesis straight s right parenthesis plus CO subscript 2 left parenthesis straight g right parenthesis plus straight H subscript 2 straight O left parenthesis straight g right parenthesis
IV) straight H subscript 2 left parenthesis straight g right parenthesis not stretchy rightwards arrow 2 straight H left parenthesis straight g right parenthesis

  1. I (-), II (+), III (+), IV (+)    
  2. I (-), II (-), III (-), IV (+)    
  3. I (-), II (-), III (+), IV (+)    
  4. I (+), II (-), III (-), IV (-)    

The correct answer is: I (-), II (+), III (+), IV (+)

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Number of phases present in the following thermodynamic systems are:
1) N H subscript 4 end subscript H S open parentheses s close parentheses rightwards arrow N H subscript 3 end subscript left parenthesis text end text g right parenthesis plus H subscript 2 end subscript text end text S left parenthesis text end text g right parenthesis
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1) N H subscript 4 end subscript H S open parentheses s close parentheses rightwards arrow N H subscript 3 end subscript left parenthesis text end text g right parenthesis plus H subscript 2 end subscript text end text S left parenthesis text end text g right parenthesis
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