Chemical & Ionic Equilibrium · JEE Main previous year questions

2024 26 questions

1. Q722024 · 9 Apr 2024 · Shift 1
   
   1. A.Pyridine > Piperidine > Pyrrole
   2. B.Pyrrole > Piperidine > Pyridine
   3. C.Pyrrole > Pyridine > Piperidine
   4. D.Piperidine > Pyridine > Pyrrole
   Show answer

   Answer: D

2. Q612024 · 9 Apr 2024 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: A

3. Q742024 · 9 Apr 2024 · Shift 2

   For a sparingly soluble salt $\mathrm{A}{\mathrm{B}}_2$, the equilibrium concentrations of ${\mathrm{A}}^{2+}$ ions and $B^{-}$ ions are $1.2\times 10^{-4}\mathrm{M}$ and $0.24\times 10^{-3}\mathrm{M}$, respectively. The solubility product of $\mathrm{A}{\mathrm{B}}_2$ is :

   1. A.$0.069\times 10^{-12}$
   2. B.$0.276\times 10^{-12}$
   3. C.$6.91\times 10^{-12}$
   4. D.$27.65\times 10^{-12}$
   Show answer

   Answer: C

4. Q722024 · 8 Apr 2024 · Shift 1

   For the given hypothetical reactions, the equilibrium constants are as follows : $\mathrm{X}\rightleftharpoons \mathrm{Y};{\mathrm{K}}_1=1.0$ $\mathrm{Y}\rightleftharpoons \mathrm{Z};{\mathrm{K}}_2=2.0$ $\mathrm{Z}\rightleftharpoons \mathrm{W};{\mathrm{K}}_3=4.0$ The equilibrium constant for the reaction $\mathrm{X}\rightleftharpoons \mathrm{W}$ is

   1. A.12.0
   2. B.8.0
   3. C.6.0
   4. D.7.0
   Show answer

   Answer: B

5. Q622024 · 8 Apr 2024 · Shift 2

   Given below are two statements : Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities Statement (II) : Blood is a naturally occurring buffer solution whose $\mathrm{pH}$ is maintained by ${\mathrm{H}}_2\mathrm{C}{\mathrm{O}}_3/HC{\mathrm{O}}_3^{\ominus }$ concentrations. In the light of the above statements, choose the correct answer from the options given below :

   1. A.Both Statement I and Statement II are false
   2. B.Both Statement I and Statement II are true
   3. C.Statement I is false but Statement II is true
   4. D.Statement I is true but Statement II is false
   Show answer

   Answer: C

6. Q722024 · 8 Apr 2024 · Shift 2

   The equilibrium $\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7^{2-}\rightleftharpoons 2\mathrm{Cr}{\mathrm{O}}_4^{2-}$ is shifted to the right in :

   1. A.a weakly acidic medium
   2. B.a basic medium
   3. C.a neutral medium
   4. D.an acidic medium
   Show answer

   Answer: B

7. Q642024 · 5 Apr 2024 · Shift 2

   Given below are two statements : Statement I : On passing ${\mathrm{HCl}}_{(g)}$ through a saturated solution of ${\mathrm{BaCl}}_2$, at room temperature white turbidity appears. Statement II : When $\mathrm{HCl}$ gas is passed through a saturated solution of $\mathrm{NaCl}$, sodium chloride is precipitated due to common ion effect. In the light of the above statements, choose the most appropriate answer from the options given below :

   1. A.Both Statement I and Statement II are correct
   2. B.Statement I is incorrect but Statement II is correct
   3. C.Both Statement I and Statement II are incorrect
   4. D.Statement I is correct but Statement II is incorrect
   Show answer

   Answer: A

8. Q622024 · 4 Apr 2024 · Shift 1

   What will be the decreasing order of basic strength of the following conjugate bases? ${}^{-}\mathrm{OH},\mathrm{R}\overline{\mathrm{O}},\mathrm{C}{\mathrm{H}}_3\mathrm{CO}\overline{\mathrm{O}},{\mathrm{Cl}}^{-}$

   1. A.${\mathrm{Cl}}^{-}>\mathrm{R}\overline{\mathrm{O}}>{}^{-}\mathrm{OH}>\mathrm{C}{\mathrm{H}}_3\mathrm{CO}\overline{\mathrm{O}}$
   2. B.${}^{-}\mathrm{OH}>\mathrm{R}\overline{\mathrm{O}}>\mathrm{C}{\mathrm{H}}_3\mathrm{CO}\overline{\mathrm{O}}>{\mathrm{Cl}}^{-}$
   3. C.${\mathrm{Cl}}^{-}>{}^{-}\mathrm{OH}>\mathrm{R}\overline{\mathrm{O}}>\mathrm{C}{\mathrm{H}}_3\mathrm{CO}\overline{\mathrm{O}}$
   4. D.$\mathrm{R}\overline{\mathrm{O}}>{}^{-}\mathrm{OH}>\mathrm{C}{\mathrm{H}}_3\mathrm{CO}\overline{\mathrm{O}}>{\mathrm{Cl}}^{-}$
   Show answer

   Answer: D

9. Q772024 · 4 Apr 2024 · Shift 2

   The equilibrium constant for the reaction ${\text{SO}}_3(\text{g})\rightleftharpoons {\text{SO}}_2(\text{g})+\frac{1}{2}{\text{O}}_2(\text{g})$ is ${\text{K}}_c=4.9\times 10^{-2}$. The value of ${\text{K}}_c$ for the reaction given below $2{\text{SO}}_2(\text{g})+{\text{O}}_2(\text{g})\rightleftharpoons 2{\text{SO}}_3(\text{g})$ is :

   1. A.49
   2. B.416
   3. C.41.6
   4. D.4.9
   Show answer

   Answer: B

10. Q662024 · 1 Feb 2024 · Shift 1

    Given below are two statements : Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution. Statement (II) : In this titration phenolphthalein can be used as indicator. In the light of the above statements, choose the most appropriate answer from the options given below :

    1. A.Both Statement I and Statement II are correct
    2. B.Statement I is incorrect but Statement II is correct
    3. C.Both Statement I and Statement II are incorrect
    4. D.Statement I is correct but Statement II is incorrect
    Show answer

    Answer: A

11. Q882024 · 1 Feb 2024 · Shift 1· Numerical answer

    ${\mathrm{K}}_{\mathrm{a}}$ for $\mathrm{C}{\mathrm{H}}_3\mathrm{COOH}$ is $1.8\times 10^{-5}$ and ${\mathrm{K}}_{\mathrm{b}}$ for $\mathrm{N}{\mathrm{H}}_4\mathrm{OH}$ is $1.8\times 10^{-5}$. The $\mathrm{pH}$ of ammonium acetate solution will be ________ .

    Show answer

    Answer: 7

12. Q622024 · 1 Feb 2024 · Shift 2

    Solubility of calcium phosphate (molecular mass, $\mathrm{M}$) in water is ${\mathrm{W}}_{\mathrm{g}}$ per $100\text{ mL}$ at $25^{\circ }\text{C}$. Its solubility product at $25^{\circ }\text{C}$ will be approximately.

    1. A.$10^7{\left(\frac{\mathrm{W}}{\mathrm{M}}\right)}^3$
    2. B.$10^3{\left(\frac{\mathrm{W}}{\mathrm{M}}\right)}^5$
    3. C.$10^7{\left(\frac{\mathrm{W}}{\mathrm{M}}\right)}^5$
    4. D.$10^5{\left(\frac{\mathrm{W}}{\mathrm{M}}\right)}^5$
    Show answer

    Answer: C

13. Q702024 · 1 Feb 2024 · Shift 2
    
    1. A.Malonic acid
    2. B.Oxalic acid
    3. C.Succinic acid
    4. D.Gluconic acid
    Show answer

    Answer: C

14. Q852024 · 1 Feb 2024 · Shift 2· Numerical answer

    For a certain reaction at $300\text{ K}$, $\mathrm{K}=10$, then $\Delta {\mathrm{G}}^{\circ }$ for the same reaction is - ________ $\times 10^{-1}{\text{ kJ mol}}^{-1}$. (Given $\mathrm{R}=8.314\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$ )

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    Answer: 57

15. Q882024 · 1 Feb 2024 · Shift 2· Numerical answer

    Consider the following redox reaction : $$\mathrm{Mn}{\mathrm{O}}_4^{-}+{\mathrm{H}}^{+}+{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4\rightleftharpoons \mathrm{M}{\mathrm{n}}^{2+}+{\mathrm{H}}_2\mathrm{O}+\mathrm{C}{\mathrm{O}}_2$$ The standard reduction potentials are given as below $\left({\mathrm{E}}_{\mathrm{red}}^0\right)$ : ${\mathrm{E}}_{\mathrm{Mn}{\mathrm{O}}_4^{-}/M{\mathrm{n}}^{2+}}^{\circ }=+1.51\text{ V}$ ${\mathrm{E}}_{\mathrm{C}{\mathrm{O}}_2/{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4}^{\circ }=-0.49\text{ V}$ If the equilibrium constant of the above reaction is given as ${\mathrm{K}}_{\mathrm{eq}}=10^x$, then the value of $x=$ ________ (nearest integer)

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    Answer: 338

16. Q722024 · 31 Jan 2024 · Shift 1

    For the given reaction, choose the correct expression of ${\mathrm{K}}_{\mathrm{C}}$ from the following :- $\mathrm{F}{\mathrm{e}}_{(\mathrm{aq})}^{3+}+\mathrm{SC}{\mathrm{N}}_{(\mathrm{aq})}^{-}\rightleftharpoons (\mathrm{FeSCN}{)}_{(\mathrm{aq})}^{2+}$

    1. A.${\mathrm{K}}_{\mathrm{C}}=\frac{[\mathrm{F}{\mathrm{e}}^{3+}][\mathrm{SC}{\mathrm{N}}^{-}]}{[\mathrm{FeSC}{\mathrm{N}}^{2+}]}$
    2. B.${\mathrm{K}}_{\mathrm{C}}=\frac{[\mathrm{FeSC}{\mathrm{N}}^{2+}]}{[\mathrm{F}{\mathrm{e}}^{3+}][\mathrm{SC}{\mathrm{N}}^{-}]}$
    3. C.${\mathrm{K}}_{\mathrm{C}}=\frac{[\mathrm{FeSC}{\mathrm{N}}^{2+}{]}^2}{[\mathrm{F}{\mathrm{e}}^{3+}][\mathrm{SC}{\mathrm{N}}^{-}]}$
    4. D.${\mathrm{K}}_{\mathrm{C}}=\frac{[\mathrm{FeSC}{\mathrm{N}}^{2+}]}{[\mathrm{F}{\mathrm{e}}^{3+}{]}^2[\mathrm{SC}{\mathrm{N}}^{-}{]}^2}$
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    Answer: B

17. Q812024 · 31 Jan 2024 · Shift 1· Numerical answer

    Consider the following reaction at $298\mathrm{K}$: $\frac{3}{2}{\mathrm{O}}_{2(\mathrm{g})}\rightleftharpoons {\mathrm{O}}_{3(\mathrm{g})};{\mathrm{K}}_{\mathrm{P}}=2.47\times 10^{-29}$. ${\Delta }_r{G}^{\ominus }$ for the reaction is ____ $\mathrm{kJ}$. (Given $\mathrm{R}=8.314\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$)

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    Answer: 163

18. Q622024 · 31 Jan 2024 · Shift 2

    ${\mathrm{A}}_{(\mathrm{g})}\rightleftharpoons {\mathrm{B}}_{(\mathrm{g})}+\frac{\mathrm{C}}{2}(\mathrm{g})$ The correct relationship between ${\mathrm{K}}_{\mathrm{P}},\alpha$ and equilibrium pressure $\mathrm{P}$ is

    1. A.$K_P=\frac{{\alpha }^{1/2}{P}^{3/2}}{(2+\alpha {)}^{3/2}}$
    2. B.$K_P=\frac{{\alpha }^{3/2}{P}^{1/2}}{(2+\alpha {)}^{1/2}(1-\alpha )}$
    3. C.$K_P=\frac{{\alpha }^{1/2}{P}^{1/2}}{(2+\alpha {)}^{3/2}}$
    4. D.$K_P=\frac{{\alpha }^{1/2}{P}^{1/2}}{(2+\alpha {)}^{1/2}}$
    Show answer

    Answer: B

19. Q642024 · 31 Jan 2024 · Shift 2

    Given below are two statements: Statement I : Group 13 trivalent halides get easily hydrolyzed by water due to their covalent nature. Statement II : $\mathrm{AlC}{\mathrm{l}}_3$ upon hydrolysis in acidified aqueous solution forms octahedral $[\mathrm{Al}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}$ ion. In the light of the above statements, choose the correct answer from the options given below :

    1. A.Statement I is false but statement II is true
    2. B.Both statement I and statement II are true
    3. C.Both statement I and statement II are false
    4. D.Statement I is true but statement II is false
    Show answer

    Answer: B

20. Q852024 · 30 Jan 2024 · Shift 1· Numerical answer

    The pH at which $\mathrm{Mg}(\mathrm{OH}{)}_2[{\mathrm{K}}_{\mathrm{sp}}=1\times 10^{-11}]$ begins to precipitate from a solution containing $0.10\text{ M}\mathrm{M}{\mathrm{g}}^{2+}$ ions is _________.

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    Answer: 9

21. Q842024 · 29 Jan 2024 · Shift 1· Numerical answer

    For the reaction ${\mathrm{N}}_2{\mathrm{O}}_{4(\mathrm{g})}\rightleftharpoons 2N{\mathrm{O}}_{2(\mathrm{g})}$, ${\mathrm{K}}_{\mathrm{p}}=0.492\text{ atm}$ at $300\text{ K}$. ${\mathrm{K}}_{\mathrm{c}}$ for the reaction at same temperature is _________ $\times 10^{-2}$. (Given : $\mathrm{R}=0.082{\text{ L atm mol}}^{-1}{\text{ K}}^{-1}$)

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    Answer: 2

22. Q842024 · 29 Jan 2024 · Shift 2· Numerical answer

    The following concentrations were observed at $500\text{ K}$ for the formation of $\mathrm{N}{\mathrm{H}}_3$ from ${\mathrm{N}}_2$ and ${\mathrm{H}}_2$. At equilibrium ; $[{\mathrm{N}}_2]=2\times 10^{-2}\mathrm{M}$, $[{\mathrm{H}}_2]=3\times 10^{-2}\mathrm{M}$ and $[\mathrm{N}{\mathrm{H}}_3]=1.5\times 10^{-2}\mathrm{M}$. Equilibrium constant for the reaction is _________.

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    Answer: 417

23. Q642024 · 27 Jan 2024 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: D

24. Q762024 · 27 Jan 2024 · Shift 1

    Given below are two statements : Statement (I) : Aqueous solution of ammonium carbonate is basic. Statement (II) : Acidic/basic nature of salt solution of a salt of weak acid and weak base depends on $K_a$ and $K_b$ value of acid and the base forming it. In the light of the above statements, choose the most appropriate answer from the options given below :

    1. A.Both Statement I and Statement II are correct
    2. B.Statement I is correct but Statement II is incorrect
    3. C.Both Statement I and Statement II are incorrect
    4. D.Statement I is incorrect but Statement II is correct
    Show answer

    Answer: A

25. Q772024 · 27 Jan 2024 · Shift 2
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: C