Chemical & Ionic Equilibrium · JEE Advanced previous year questions

2025 4 questions

1. Q412025 · 18 May 2025 · Paper 1· Numerical answer

   At 25 °C, the concentration of ${\mathrm{H}}^{+}$ ions in $1.00\times 10^{-3}$ M aqueous solution of a weak monobasic acid having acid dissociation constant $(K_{\mathrm{a}})$ of $4.00\times 10^{-11}$ is $\mathbf{X}\times 10^{-7}$ M. The value of $\mathbf{X}$ is ____. $\text{Use}$: Ionic product of water $(K_{\mathrm{w}})=1.00\times 10^{-14}$ at 25 °C

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   Answer: 2.2 to 2.3

2. Q342025 · 18 May 2025 · Paper 2

   The complete hydrolysis of $\mathrm{ICl}$, $\mathrm{Cl}{\mathrm{F}}_3$ and $\mathrm{Br}{\mathrm{F}}_5$, respectively, gives

   1. A.$\mathrm{I}{\mathrm{O}}^{-}$, $\mathrm{Cl}{\mathrm{O}}_2^{-}$ and $\mathrm{Br}{\mathrm{O}}_3^{-}$
   2. B.$\mathrm{I}{\mathrm{O}}_3^{-}$, $\mathrm{Cl}{\mathrm{O}}_2^{-}$ and $\mathrm{Br}{\mathrm{O}}_3^{-}$
   3. C.$\mathrm{I}{\mathrm{O}}^{-}$, $\mathrm{Cl}{\mathrm{O}}^{-}$ and $\mathrm{Br}{\mathrm{O}}_2^{-}$
   4. D.$\mathrm{I}{\mathrm{O}}_3^{-}$, $\mathrm{Cl}{\mathrm{O}}_4^{-}$ and $\mathrm{Br}{\mathrm{O}}_2^{-}$
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   Answer: A

3. Q402025 · 18 May 2025 · Paper 2· One or more correct
   
   1. A.$\mathbf{P}$ is optically active.
   2. B.$\mathbf{S}$ gives Bayer's test.
   3. C.$\mathbf{Q}$ gives effervescence with aq. ${\mathrm{NaHCO}}_3$.
   4. D.$\mathbf{R}$ is an alkyne.
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   Answer: B, C

4. Q422025 · 18 May 2025 · Paper 2· Numerical answer

   The solubility of barium iodate in an aqueous solution prepared by mixing $200\text{ mL}$ of $0.010\text{ M}$ barium nitrate with $100\text{ mL}$ of $0.10\text{ M}$ sodium iodate is $X\times 10^{-6}{\text{ mol dm}}^{-3}$. The value of $X$ is _________. $\text{Use:}$ Solubility product constant ($K_{\text{sp}}$) of barium iodate $=1.58\times 10^{-9}$

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   Answer: 3.85 to 4.15