question_answer 1)

  In an exothermic reaction, heat is evolved and system loses heat to the surroundings. For such system: (a) \[{{q}_{p}}\]will be negative                                                (b) \[{{\Delta }_{r}}H\]will be negative (c) \[{{q}_{p}}\]will be positive                                                  (d) \[{{\Delta }_{r}}H\]will be positive

Answer:

  (a, b) In exothermic reactions: \[{{\Delta }_{r}}H\] or \[{{q}_{p}}=-ve\]