Spontaneity - Entropy and Spontaneity

In which of the following processes entropy increases?

1. A liquid evaporates to vapour.
2. Temperature of a crystalline solid lowered from 130 K to 0 K.
3. \[\ce{2NaHCO3_{(s)} -> Na2CO3_{(s)} + CO2_{(s)} + H2O_{(g)}}\]
4. \[\ce{Cl2_{(g)} -> 2Cl_{(g)}}\]

Choose the correct answer from the options given below:

For the reaction, \[\ce{2Cl_{(g)} → Cl_{2(g)}}\], what are the signs of ΔH and ΔS?

For the irreversible expansion of an ideal gas under isothermal conditions, the correct option is ______.

The entropy change can be calculated by using the expression ∆S = `q_(rev)/T`. When water freezes in a glass beaker, choose the correct statement amongst the following :

Match the following processes with entropy change:

Assertion (A): A liquid crystallises into a solid and is accompanied by decrease in entropy.

Reason (R): In crystals, molecules organise in an ordered manner.

The spontaneity means, having the potential to proceed without the assistance of external agency. The processes which occur spontaneously are:

(i) Flow of heat from colder to warmer body.

(ii) Gas in a container contracting into one corner.

(iii) Gas expanding to fill the available volume.

(iv) Burning carbon in oxygen to give carbon dioxide.

Enthalpy diagram for a particular reaction is given in figure. Is it possible to decide spontaneity of a reaction from given diagram. Explain.