Predict in which of the following, entropy increases // decreases . (i) A liquid crystallizes into a solid (ii) Temperaure of a crystalline solid israised from0Kto 115K (iii) 2 NaHCO_(3)(s) rarr Na_(2)CO_(3)(s) + CO_(2)(g) + H_(2)O(g) (iv)H_(2)(g) rarr 2H(g)

Predict in which of the following, entropy increases // decreases . (

1.	Predict in which of the following, entropy increases // decreases . (i) A liquid crystallizes into a solid (ii) Temperaure of a crystalline solid israised from0Kto 115K (iii) 2 NaHCO_(3)(s) rarr Na_(2)CO_(3)(s) + CO_(2)(g) + H_(2)O(g) (iv)H_(2)(g) rarr 2H(g)
Answer» Solution :(i) Decreases becausea SOLID has ORDERED ARRANGEMENT of constituent particles. (ii) INCREASES because at 0K,there isa perfect order of constituent particles. As temperature is increased , the particlestart vibrating about their equilibrium position. Hence, a disorder sets in. (iii)Increases becausethe reactant is solid whereas products have gaseous substances. (iv) Increases because the products havelarger (DOUBLE) number of particles.