List of top Chemistry Questions on Spontaneity asked in JEE Main

Match List I with List II

List I		List II
A	Physisorption	i	Single Layer Adsorption
B	Chemisorption	ii	20−40kJmol−1
C	N₂(g)+3H₂(g)—⇢^Fe(s)_^—⇢2NH₃(g)	iii	Chromatography
D	Analytical Application or Adsorption	iv	Heterogeneous catalysis

Choose the correct answer from the options given below:

For independent processes at 300K

Process	ΔH/kJmol⁻¹	ΔS/JK⁻¹
A	-25	-80
B	-22	40
C	25	-50
D	22	20

The number of non-spontaneous processes from the following is

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.

Assertion A : Magnesium can reduce Al₂O₃ at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO.
Reason R : The melting and boiling points of magnesium are lower than those of aluminium.

In light of the above statements, choose the most appropriate answer from the options given below :

The process with negative entropy change is :