Predict in which of the following , entropy increases or decreases . (i) A liquid crystallizes into a solid (ii)Temperature of a crystallized solid is raised from 0 K to 115 K (iii)2NaHCO_(3(s)) to Na_2CO_(3(s)) + CO_(2(g)) + H_2O_((g)) (iv)H_(2(g)) to 2H_((g))

Predict in which of the following , entropy increases or decreases .

1.	Predict in which of the following , entropy increases or decreases . (i) A liquid crystallizes into a solid (ii)Temperature of a crystallized solid is raised from 0 K to 115 K (iii)2NaHCO_(3(s)) to Na_2CO_(3(s)) + CO_(2(g)) + H_2O_((g)) (iv)H_(2(g)) to 2H_((g))
Answer» Solution :(i)After FREEZING, the molecules attain an ordered state and therefore, entropy decreases. (ii) At 0 K the constituent particles are in static form therefore, entropy is minimum. If the temperature is RAISED to 115 K particles begin to move and entropy increases (iii) Reactant, `NaHCO_3` is solid, THUS, its entropy is LESS in comparison to product which hashigh entropy (iv)Here, one molecule gives two atoms. Thus, number of particles increases and this leads to more disordered form.