Question

10.    Select the correct statement.

         A)     In an exothermic reaction, the surroundings releases heat.

         B)     If the sign of w is negative, the reaction is always exothermic.

         C)     If ΔE is negative, the reaction is always exothermic.

         D)     When the surroundings gains heat, the reaction is exothermic.

Answer 1

endothermic reaction - heat is gained or utilized in the reaction

exothermic reaction - heat is released or lost in the reaction

A) surroundings releases heat means the heat is gained by the system so it is an endothermic reaction

B) W < O i.e work done by the system then the energy of the system is decreases i.e heat is released so the reaction is exothermic reaction

C) delta E is negative means it is exothermic reaction but also depends on the q value

D) surroundings gains heat means the heat lost by the system then it is called exothermic reaction

answer => B , C , D