JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
- A \(Ti^{2+}\)
- B \(V^{2+}\)
- C \(Cr^{2+}\)
- D \(Mn^{2+}\)
Answer & Solution
Correct Answer
(D) \(Mn^{2+}\)
Step-by-step Solution
Detailed explanation
ions \(E^o\,(V)\) \(Ti^{2+}\) \(-0.37\) \(V^{2+}\) \(-0.26\) \(Cr^{2+}\) \(-0.41\) \(Mn^{2+}\) \(+1.57\) Negative value of \(E^o\) means these metals librate hydrogen from dilute acid. \(({M^{2 + }}\, + \,2{H^ + }\, - \,{e^ - }\, \to \,{M^{3 + }}\, + \,{H_2})\)
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
- The reaction at cathode in the cells commonly used in clocks involves _______.JEE Mains 2024 Medium
- \(K _{ a }\) for butyric acid \(\left( C _{3} H _{7} COOH \right)\) is \(2 \times 10^{-5}\). The \(pH\) of \(0.2 M\) solution of butyric acid is \(...........\times 10^{-1}\). (Nearest integer) [Given \(\log 2=0.30]\)JEE Mains 2022 Medium
- In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl . The percentage composition of chlorine in the compound is _______ %.
(Given : molar mass in \(\mathrm{g} \mathrm{mol}^{-1}\) of \(\mathrm{Ag}: 108, \mathrm{Cl}: 35.5\) )JEE Mains 2025 Medium - Which one of the following compounds of Group\(-14\) elements is not known?JEE Mains 2021 Medium
- During the denaturation of proteins, which of these structures will remain intact?JEE Mains 2022 Easy
- In the following reactions products \((A)\) and \((B)\). respectively, are \(\mathrm{NaOH}+\mathrm{Cl}_{2} \rightarrow(\mathrm{A})+\) side products (hot and conc.) \(\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \rightarrow(\mathrm{B})+\) side products \((dry)\)JEE Mains 2020 Hard
More PYQs from JEE Mains
- The increasing order of basicity for the following intermediates is (from weak to strong) \((i)\) \(\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{C{H_3} - {C^ \mathbf{-} }} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}\) \((ii)\) \(H _{2} C = CH - CH _{2}\) \((iii)\) \(HC \equiv \stackrel{\ominus}{ C }\) \((iv)\) \(\stackrel{\ominus}{ CH _{3}}\) \((v)\) \(\stackrel{\ominus}{{ }_{ CN }}\)JEE Mains 2020 Hard - Let \([ t ]\) denotes the greatest integer \(\leq t\). Then \(\frac{2}{\pi} \int \limits_{\pi / 6}^{5 \pi / 6}(8[\operatorname{cosec} x]-5[\cot x]) d x\) is equal toJEE Mains 2023 Hard
- The electric field due to a short electric dipole at a large distance (r) from center of dipole on the equatorial plane varies with distance asJEE Mains 2023 Medium
- Let a vector \(\vec{a}\) be coplanar with vectors \(\vec{b}=2 \hat{i}+\hat{j}+\hat{k}\) and \(\vec{c}=\hat{i}-\hat{j}+\hat{k} .\) If \(\vec{a}\) is perpendicular to \(\vec{d}=3 \vec{i}+2 \hat{j}+6 \hat{k}\), and \(|\vec{a}|=\sqrt{10} .\) Then a possible value of \([\overrightarrow{\mathrm{a}} \overrightarrow{\mathrm{b}} \overrightarrow{\mathrm{c}}]+[\overrightarrow{\mathrm{a}} \overrightarrow{\mathrm{b}} \vec{d}]+[\overrightarrow{\mathrm{a}} \vec{c} \vec{d}]\) is equal to:JEE Mains 2021 Hard
- Consider two uniform discs of the same thickness and different radii \(R _{1}= R\) and \(R _{2}=\alpha R\) made of the same material. If the ratio of their moments of inertia \(I_{1}\) and \(I_{2}\), respectively, about their axes is \(I _{1}: I _{2}=1: 16\) then the value of \(\alpha\) isJEE Mains 2020 Hard
- In a \(\triangle A B C\), suppose \(y=x\) is the equation of the bisector of the angle \(B\) and the equation of the side \(A C\) is \(2 x-y=2\). If \(2 A B=B C\) and the point \(A\) and \(B\) are respectively \((4,6)\) and \((\alpha, \beta)\), then \(\alpha+2 \beta\) is equal toJEE Mains 2024 Medium