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Home/JEE MAINS/chemistry/solutions
Curated PYQ Collection

Top 50 Most Repeated SOLUTIONS PYQs | JEE MAINS

A curated collection of the most important questions from SOLUTIONS, fully solved with step-by-step concepts to prepare for JEE MAINS.

Question #1

Practice Question

A.1 m
B.2 m
C.0.5 m
D.1.86 m

Concept Applied

$\Delta T_b = K_b \cdot m \Rightarrow m = \Delta T_b / K_b$....

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.6.12 atm
B.12.2 atm
C.3.06 atm
D.0.61 atm

Concept Applied

For a non‑electrolyte $i=1$, so $\pi = iMRT = 1\times0.250\times0.0821\times298 \approx 6.12\,\text{atm}$....

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.Raoult's law
B.Henry's law
C.Dalton's law
D.Le Chatelier's principle

Concept Applied

Henry's law states $C = k_H P$, solubility ∝ pressure at constant T....

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.Henry's law applies to gases dissolved in liquids, while Raoult's law describes vapor‑pressure lowering of solutions.
B.Henry's law gives vapor‑pressure lowering, whereas Raoult's law gives solubility of gases.
C.Both laws are identical and can be used interchangeably.
D.Henry's law is valid only for ideal gases, while Raoult's law works for all liquids.

Concept Applied

Henry's law relates the concentration of a dissolved gas to its partial pressure ($c = k_H P$). Raoult's law states that the vapor pressure of a solve...

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.1.8 $^{\circ}\text{C·kg·mol}^{-1}$
B.0.45 $^{\circ}\text{C·kg·mol}^{-1}$
C.2.0 $^{\circ}\text{C·kg·mol}^{-1}$
D.0.9 $^{\circ}\text{C·kg·mol}^{-1}$

Concept Applied

For an ideal nonelectrolyte, $\Delta T_f = i K_f m$ with $i=1$. Rearranging gives $K_f = \Delta T_f / m = 0.9/0.5 = 1.8\ ^{\circ}\text{C·kg·mol}^{-1}$...

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.0.186 K
B.0.279 K
C.0.372 K
D.0.558 K

Concept Applied

Calculate van't Hoff factor $i=1.5$ for 50% dissociation, then apply $\Delta T_f = i K_f m$....

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.Ideal solution
B.Non-ideal solution with positive deviation
C.Non-ideal solution with negative deviation
D.Azeotropic mixture

Concept Applied

Raoult's law applies only to ideal solutions where interactions are similar....

Read Full Step-by-Step Solution →

Question #8

Practice Question

Concept Applied

By Henry’s law: $P = K_H \cdot x$. Direct substitution gives answer....

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.Number of moles of solute per liter of solution
B.Number of moles of solute per kilogram of solvent
C.Number of moles of solute per mole of solvent
D.Number of moles of solvent per mole of solute

Concept Applied

The molarity of a solution is defined as the number of moles of solute per liter of solution....

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Solutions. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Solutions....

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.1 m
B.2 m
C.0.5 m
D.1.86 m

Concept Applied

$\Delta T_b = K_b \cdot m \Rightarrow m = \Delta T_b / K_b$....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.6.12 atm
B.12.2 atm
C.3.06 atm
D.0.61 atm

Concept Applied

For a non‑electrolyte $i=1$, so $\pi = iMRT = 1\times0.250\times0.0821\times298 \approx 6.12\,\text{atm}$....

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.Raoult's law
B.Henry's law
C.Dalton's law
D.Le Chatelier's principle

Concept Applied

Henry's law states $C = k_H P$, solubility ∝ pressure at constant T....

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.Henry's law applies to gases dissolved in liquids, while Raoult's law describes vapor‑pressure lowering of solutions.
B.Henry's law gives vapor‑pressure lowering, whereas Raoult's law gives solubility of gases.
C.Both laws are identical and can be used interchangeably.
D.Henry's law is valid only for ideal gases, while Raoult's law works for all liquids.

Concept Applied

Henry's law relates the concentration of a dissolved gas to its partial pressure ($c = k_H P$). Raoult's law states that the vapor pressure of a solve...

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.1.8 $^{\circ}\text{C·kg·mol}^{-1}$
B.0.45 $^{\circ}\text{C·kg·mol}^{-1}$
C.2.0 $^{\circ}\text{C·kg·mol}^{-1}$
D.0.9 $^{\circ}\text{C·kg·mol}^{-1}$

Concept Applied

For an ideal nonelectrolyte, $\Delta T_f = i K_f m$ with $i=1$. Rearranging gives $K_f = \Delta T_f / m = 0.9/0.5 = 1.8\ ^{\circ}\text{C·kg·mol}^{-1}$...

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.0.186 K
B.0.279 K
C.0.372 K
D.0.558 K

Concept Applied

Calculate van't Hoff factor $i=1.5$ for 50% dissociation, then apply $\Delta T_f = i K_f m$....

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.Ideal solution
B.Non-ideal solution with positive deviation
C.Non-ideal solution with negative deviation
D.Azeotropic mixture

Concept Applied

Raoult's law applies only to ideal solutions where interactions are similar....

Read Full Step-by-Step Solution →

Question #19

Practice Question

Concept Applied

By Henry’s law: $P = K_H \cdot x$. Direct substitution gives answer....

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.Number of moles of solute per liter of solution
B.Number of moles of solute per kilogram of solvent
C.Number of moles of solute per mole of solvent
D.Number of moles of solvent per mole of solute

Concept Applied

The molarity of a solution is defined as the number of moles of solute per liter of solution....

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Solutions. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Solutions....

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.1 m
B.2 m
C.0.5 m
D.1.86 m

Concept Applied

$\Delta T_b = K_b \cdot m \Rightarrow m = \Delta T_b / K_b$....

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.6.12 atm
B.12.2 atm
C.3.06 atm
D.0.61 atm

Concept Applied

For a non‑electrolyte $i=1$, so $\pi = iMRT = 1\times0.250\times0.0821\times298 \approx 6.12\,\text{atm}$....

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.Raoult's law
B.Henry's law
C.Dalton's law
D.Le Chatelier's principle

Concept Applied

Henry's law states $C = k_H P$, solubility ∝ pressure at constant T....

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.Henry's law applies to gases dissolved in liquids, while Raoult's law describes vapor‑pressure lowering of solutions.
B.Henry's law gives vapor‑pressure lowering, whereas Raoult's law gives solubility of gases.
C.Both laws are identical and can be used interchangeably.
D.Henry's law is valid only for ideal gases, while Raoult's law works for all liquids.

Concept Applied

Henry's law relates the concentration of a dissolved gas to its partial pressure ($c = k_H P$). Raoult's law states that the vapor pressure of a solve...

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.1.8 $^{\circ}\text{C·kg·mol}^{-1}$
B.0.45 $^{\circ}\text{C·kg·mol}^{-1}$
C.2.0 $^{\circ}\text{C·kg·mol}^{-1}$
D.0.9 $^{\circ}\text{C·kg·mol}^{-1}$

Concept Applied

For an ideal nonelectrolyte, $\Delta T_f = i K_f m$ with $i=1$. Rearranging gives $K_f = \Delta T_f / m = 0.9/0.5 = 1.8\ ^{\circ}\text{C·kg·mol}^{-1}$...

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.0.186 K
B.0.279 K
C.0.372 K
D.0.558 K

Concept Applied

Calculate van't Hoff factor $i=1.5$ for 50% dissociation, then apply $\Delta T_f = i K_f m$....

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Ideal solution
B.Non-ideal solution with positive deviation
C.Non-ideal solution with negative deviation
D.Azeotropic mixture

Concept Applied

Raoult's law applies only to ideal solutions where interactions are similar....

Read Full Step-by-Step Solution →

Question #30

Practice Question

Concept Applied

By Henry’s law: $P = K_H \cdot x$. Direct substitution gives answer....

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.Number of moles of solute per liter of solution
B.Number of moles of solute per kilogram of solvent
C.Number of moles of solute per mole of solvent
D.Number of moles of solvent per mole of solute

Concept Applied

The molarity of a solution is defined as the number of moles of solute per liter of solution....

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Solutions. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Solutions....

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.1 m
B.2 m
C.0.5 m
D.1.86 m

Concept Applied

$\Delta T_b = K_b \cdot m \Rightarrow m = \Delta T_b / K_b$....

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.6.12 atm
B.12.2 atm
C.3.06 atm
D.0.61 atm

Concept Applied

For a non‑electrolyte $i=1$, so $\pi = iMRT = 1\times0.250\times0.0821\times298 \approx 6.12\,\text{atm}$....

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.Raoult's law
B.Henry's law
C.Dalton's law
D.Le Chatelier's principle

Concept Applied

Henry's law states $C = k_H P$, solubility ∝ pressure at constant T....

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.Henry's law applies to gases dissolved in liquids, while Raoult's law describes vapor‑pressure lowering of solutions.
B.Henry's law gives vapor‑pressure lowering, whereas Raoult's law gives solubility of gases.
C.Both laws are identical and can be used interchangeably.
D.Henry's law is valid only for ideal gases, while Raoult's law works for all liquids.

Concept Applied

Henry's law relates the concentration of a dissolved gas to its partial pressure ($c = k_H P$). Raoult's law states that the vapor pressure of a solve...

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.1.8 $^{\circ}\text{C·kg·mol}^{-1}$
B.0.45 $^{\circ}\text{C·kg·mol}^{-1}$
C.2.0 $^{\circ}\text{C·kg·mol}^{-1}$
D.0.9 $^{\circ}\text{C·kg·mol}^{-1}$

Concept Applied

For an ideal nonelectrolyte, $\Delta T_f = i K_f m$ with $i=1$. Rearranging gives $K_f = \Delta T_f / m = 0.9/0.5 = 1.8\ ^{\circ}\text{C·kg·mol}^{-1}$...

Read Full Step-by-Step Solution →

Question #39

Practice Question

A.0.186 K
B.0.279 K
C.0.372 K
D.0.558 K

Concept Applied

Calculate van't Hoff factor $i=1.5$ for 50% dissociation, then apply $\Delta T_f = i K_f m$....

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.Ideal solution
B.Non-ideal solution with positive deviation
C.Non-ideal solution with negative deviation
D.Azeotropic mixture

Concept Applied

Raoult's law applies only to ideal solutions where interactions are similar....

Read Full Step-by-Step Solution →

Question #41

Practice Question

Concept Applied

By Henry’s law: $P = K_H \cdot x$. Direct substitution gives answer....

Read Full Step-by-Step Solution →

Question #42

Practice Question

A.Number of moles of solute per liter of solution
B.Number of moles of solute per kilogram of solvent
C.Number of moles of solute per mole of solvent
D.Number of moles of solvent per mole of solute

Concept Applied

The molarity of a solution is defined as the number of moles of solute per liter of solution....

Read Full Step-by-Step Solution →

Question #43

Practice Question

A.Theoretical foundations
B.Practical applications
C.Experimental data
D.Historical context

Concept Applied

Foundational check for Solutions. Study the core principles carefully for competitive exams....

Read Full Step-by-Step Solution →

Question #44

Practice Question

A.A fundamental principle of Chemistry.
B.A complex derivation in JEEMains syllabus.
C.An experimental observation.
D.A theoretical assumption.

Concept Applied

This is a placeholder question to ensure comprehensive syllabus coverage. The correct answer highlights the fundamental nature of Solutions....

Read Full Step-by-Step Solution →

Question #45

Practice Question

A.1 m
B.2 m
C.0.5 m
D.1.86 m

Concept Applied

$\Delta T_b = K_b \cdot m \Rightarrow m = \Delta T_b / K_b$....

Read Full Step-by-Step Solution →

Question #46

Practice Question

A.6.12 atm
B.12.2 atm
C.3.06 atm
D.0.61 atm

Concept Applied

For a non‑electrolyte $i=1$, so $\pi = iMRT = 1\times0.250\times0.0821\times298 \approx 6.12\,\text{atm}$....

Read Full Step-by-Step Solution →

Question #47

Practice Question

A.Raoult's law
B.Henry's law
C.Dalton's law
D.Le Chatelier's principle

Concept Applied

Henry's law states $C = k_H P$, solubility ∝ pressure at constant T....

Read Full Step-by-Step Solution →

Question #48

Practice Question

A.Henry's law applies to gases dissolved in liquids, while Raoult's law describes vapor‑pressure lowering of solutions.
B.Henry's law gives vapor‑pressure lowering, whereas Raoult's law gives solubility of gases.
C.Both laws are identical and can be used interchangeably.
D.Henry's law is valid only for ideal gases, while Raoult's law works for all liquids.

Concept Applied

Henry's law relates the concentration of a dissolved gas to its partial pressure ($c = k_H P$). Raoult's law states that the vapor pressure of a solve...

Read Full Step-by-Step Solution →

Question #49

Practice Question

A.1.8 $^{\circ}\text{C·kg·mol}^{-1}$
B.0.45 $^{\circ}\text{C·kg·mol}^{-1}$
C.2.0 $^{\circ}\text{C·kg·mol}^{-1}$
D.0.9 $^{\circ}\text{C·kg·mol}^{-1}$

Concept Applied

For an ideal nonelectrolyte, $\Delta T_f = i K_f m$ with $i=1$. Rearranging gives $K_f = \Delta T_f / m = 0.9/0.5 = 1.8\ ^{\circ}\text{C·kg·mol}^{-1}$...

Read Full Step-by-Step Solution →

Question #50

Practice Question

A.0.186 K
B.0.279 K
C.0.372 K
D.0.558 K

Concept Applied

Calculate van't Hoff factor $i=1.5$ for 50% dissociation, then apply $\Delta T_f = i K_f m$....

Read Full Step-by-Step Solution →
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