Question

Out of the following, which is not an exothermic reaction?Mark it:(a) immersing iron pieces in water,(b) burning of candle​

Answer 1

Answer:

(b) Burning of candle

Explanation:

Because when iron pieces are immersed in water,they don't release any kind of heat or light energy.

But, a candle when burnt,it gives out both heat and light energy which are the properties of an exothermic reaction.

Hope this is helpful for u...

Answer 2

Immersing iron pieces in water is not an exothermic reaction ( option-a).

• In thermodynamics, there are two types of reaction- one is an endothermic reaction and another is an exothermic reaction.

• Endothermic reaction is a reaction in which heat or energy is given to the system and ΔH is positive.

       For example, the evaporation and melting process are the endothermic processes as heat is given to the system to vaporize water and melt the solid ice respectively.

• Exothermic reactions are those reactions that liberate heat energy in the surroundings and ΔH is negative.

        For example, The burning of a candle is an exothermic reaction as on burning a candle, heat and light energy are liberated.