JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
The \(pH\) at which \(\mathrm{Mg}(\mathrm{OH})_2\left[\mathrm{~K}_{\mathrm{sp}}=1 \times 10^{-11}\right]\) begins to precipitate from a solution containing \(0.10 \ \mathrm{M}\) \(\mathrm{Mg}^{2+}\) ions is _______.
- A \(08\)
- B \(09\)
- C \(10\)
- D \(11\)
Answer & Solution
Correct Answer
(B) \(09\)
Step-by-step Solution
Detailed explanation
Precipitation when \(Q_{s p}=K_{s p}\) \({\left[\mathrm{Mg}^{2+}\right][\mathrm{OH}]^2=10^{-11}}\) \(0.1 \times\left[\mathrm{OH}^{-}\right]^2=10^{-11} \Rightarrow\left[\mathrm{OH}^{-}\right]=10^{-5}\) \(\Rightarrow \mathrm{pOH}=5 \quad \Rightarrow \mathrm{pH}=9\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- An oxide of iron contains \(69.9\%\) iron, its empirical formula, is: (Given: Molar mass of Fe and O are \(56\) and \(16\) g mol\(^{-1}\) respectively.)JEE Mains 2026 Easy
- The oxide that shows magnetic property is :JEE Mains 2021 Medium
- At \(298\, \mathrm{~K}\), the enthalpy of fusion of a solid \((\mathrm{X})\) is \(2.8 \,\mathrm{k} \mathrm{J}\, \mathrm{mol}^{-1}\) and the enthalpy of vaporisation of the liquid \((X)\) is \(98.2 \,\mathrm{~kJ}\, \mathrm{~mol}^{-1}\). The enthalpy of sublimation of the substance \((\mathrm{X})\) in \(\mathrm{kJ} \,\mathrm{mol}^{-1}\) is \(.....\) (in nearest integer)JEE Mains 2021 Hard
- Consider the following two reactions A and B.
Numerical value of [molar mass of x + molar mass of y] is _____.JEE Mains 2026 Hard - The equilibrium \(\mathrm{Cr}_2 \mathrm{O}_7^{2-} \rightleftharpoons 2 \mathrm{CrO}_4^{2-}\) is shifted to the right in _______.JEE Mains 2024 Medium
- Number of geometrical isomers possible for the given structure is _______.
JEE Mains 2024 Hard
More PYQs from JEE Mains
- If the standard electrode potential for a cell is \(2\,V\) at \(300\,K,\) the equilibrium constant \((K)\) for the reaction \(Zn\,(s)\,\, + \,\,C{u^{2 + }}\,(aq)\, \rightleftharpoons \,Z{n^{2 + \,}}\,(aq)\, + Cu\,(s)\) At \(300\,K\) is approximately \((R = 8 \,JK^{-1}\,mol^{-1},\, F = 96000\,C\,mol^{-1})\)JEE Mains 2019 Hard
- Let \(B=\left[\begin{array}{ll}1 & 3 \\ 1 & 5\end{array}\right]\) and \(A\) be a \(2 \times 2\) matrix such that \(\mathrm{AB}^{-1}=\mathrm{A}^{-1}\). If \(\mathrm{BCB}^{-1}=\mathrm{A}\) and \(\mathrm{C}^4+\alpha \mathrm{C}^2+\beta \mathrm{I}=\mathrm{O}\), then \(2 \beta-\alpha\) is equal to :JEE Mains 2024 Hard
- If the set of all values of a, for which the equation \(5 x^3-15 x-a=0\) has three distinct real roots, is the interval \((\alpha, \beta)\), then \(\beta-2 \alpha\) is equal to ______JEE Mains 2025 Medium
- One of the points of intersection of the curves \(\mathrm{y}=1+3 \mathrm{x}-2 \mathrm{x}^2\) and \(\mathrm{y}=\frac{1}{\mathrm{x}}\) is \(\left(\frac{1}{2}, 2\right)\). Let the area of the region enclosed by these curves be \(\frac{1}{24}(\ell \sqrt{5}+\mathrm{m})-\operatorname{nlog}_{\mathrm{e}}(1+\sqrt{5})\), where \(\ell, \mathrm{m}, \mathrm{n} \in\) \(\mathrm{N}\). Then \(\ell+\mathrm{m}+\mathrm{n}\) is equal toJEE Mains 2024 Hard
- The number of integral values of \(m\) for which the equation \((1 + m^2) x^2 - 2(1 + 3m) x + (1 + 8m) = 0\) has no real root isJEE Mains 2019 Hard
- An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution would _______.
(Given \(\log 2=0.30)\)JEE Mains 2025 Easy