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Giventhat-Zn+½O2→ZnO+84000cal..........1 Hg++O →HgO+21700cal.........2 Thheat oreactioH) forZn+HgO→ ZnO+Hg is-

  1. 105700cal    
  2. 62300cal    
  3. –105700cal    
  4. –62300cal    

The correct answer is: –62300cal

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