Question

Which Of The Following Would You Predict To Have A Positive Value For ΔSº a.)AgCl(s) → Ag+(aq) + Cl-(aq) b.)H2O(g) → H2O(l) c.)2 Na(s) + Cl2(g) → 2NaCl(s) d.)Br2(l) → Br2(s)

Answer 1

PLATO answer is A.........................

Answer 2

Answer : The correct option is, (A)

Explanation :

Entropy : It is the measurement of disorderedness in a system.

The order of entropy will be,

As we are moving from solid state to liquid state to gaseous state, the entropy will be increases due to the increase in the disorderedness.

As we are moving from gaseous state to liquid state to solid state, the entropy will be decreases due to the decrease in the disorderedness and the entropy will be, positive.

In option A, the solid dissociates into ions that means the entropy will increases due to the increase in the disorderedness and the entropy will be, positive.

In option B, the reaction goes from gaseous state to liquid state that means the entropy will decreases due to the decrease in the disorderedness and the entropy will be, negative.

In option C, the reaction goes from gaseous state to solid state that means the entropy will decreases due to the decrease in the disorderedness and the entropy will be, negative.

In option D, the reaction goes from liquid state to solid state that means the entropy will decreases due to the decrease in the disorderedness and the entropy will be, negative.

Hence, the correct option is, (A)