JEE-MAIN SERIES Chemistry
Spontaneity
4 previous year questions.
Volume: 4 Ques
Yield: Medium
High-Yield Trend
2
2023 1
2022 1
2019 Chapter Questions 4 MCQs
01
PYQ 2019
easy
chemistry ID: jee-main
The process with negative entropy change is :
1
Dissolution of iodine in water
2
Synthesis of ammonia from and
3
Dissolution of to and
4
Subimation of dry ice
02
PYQ 2022
medium
chemistry ID: jee-main
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 :
1
Both A and R are correct, and R is correct explanation of A.
2
Both A and R are correct, but R is NOT the correct explanation of A.
3
A is correct R is not correct.
4
A is not correct, R is correct.
03
PYQ 2023
easy
chemistry ID: 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:
1
A - III, B - IV, C - I, D - II
2
A - II, B - III, C - I, D - IV
3
A - II, B - I, C - IV, D - III
4
A - IV, B - II, C - III, D - I
04
PYQ 2023
easy
chemistry ID: jee-main
For independent processes at 300K
The number of non-spontaneous processes from the following is
| 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