JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
The photoelectric current from Na (work function, \(\left. w _{0}=2.3\, eV \right)\) is stopped by the output voltage of the cell \(Pt ( s )\left| H _{2}( g , 1 bar )\right| HCl ( aq \cdot, pH =1)| AgCl ( s )| Ag ( s )\) The \(pH\) of aq. HCl required to stop the photoelectric current from \(K \left( w _{0}=2.25 eV \right),\) all other conditions remaining the same, is..........\(\times 10^{-2}\) (to the nearest integer). Given, \(2.303 \frac{ RT }{ F }=0.06 V ; E _{ AgC1|Ag|C ^{-}}^{0}=0.22\, V\)
- A \(146\)
- B \(150\)
- C \(142\)
- D \(154\)
Answer & Solution
Correct Answer
(C) \(142\)
Step-by-step Solution
Detailed explanation
\(\frac{1}{2} H _{2} \rightarrow H ^{+}+ e ^{\ominus}\) \(e ^{\ominus}+ AgCl _{(s)} \rightarrow Ag _{(s)}+ Cl ^{\ominus}\) _______________________________________________________ \(\frac{1}{2} H _{2}+ AgCl _{(s)} \rightarrow H _{( aq )}^{+}+ Ag _{(s)}+ Cl _{( aq )}^{\ominus}\)…
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
- Two positively charged particles \(m_{1}\) and \(m_{2}\) have been accelerated across the same potential difference of 200 keV as shown below.
[Given mass of \(m_{1} = 1 amu\) and \(m_{2} = 4 amu\)].
The deBroglie wavelength of \(m_{1}\) will be x times of \(m_{2}\). The value of x is __________ . (nearest integer)JEE Mains 2026 Easy - Total number of non bonded electrons present in \(\mathrm{NO}_2{ }^{-}\)ion based on Lewis theory is :JEE Mains 2025 Easy
- Benzyl isocyanide can be obtained by: Choose the correct answer from the options given below:
JEE Mains 2023 Medium - The resistance of conductivity cell containing \(0.01\, M\, KCl\) solution at \(298\, K\) is \(1750 \,\Omega\). If the conductively of \(0.01\, M \,KCl\) solution at \(298\, K\) is \(0.152 \times 10^{-3} \,S \,cm ^{-1}\), then the cell constant of the conductivity cell is \(..........\,\times 10^{-3} \,cm ^{-1}\).JEE Mains 2022 Medium
- In reaction \(A + 2B\) \( \rightleftharpoons \) \(2C + D\), initial concentration of \(B\) was \(1.5\, times\) of \([A]\) , but at equilibrium the concentrations of \(A\) and \(B\) became equal. The equilibrium constant for the reaction isJEE Mains 2019 Hard
- Class \(XII\) students were asked to prepare one litre of buffer solution of \(pH\,8.26\) by their chemistry teacher. The amount of ammonium chloride to be dissolved by the student in \(0.2\,M\) ammonia solution to make one litre of the buffer is \(.....\,g\) (Given \(pK _{ b }\left( NH _{3}\right)=4.74\); Molar mass of \(NH _{3}=17\,g\,mol ^{-}\) ; Molar mass of \(NH _{4} Cl =53.5\,g\,mol ^{-1}\) )JEE Mains 2022 Medium
More PYQs from JEE Mains
- The instantaneous rate of disappearance of \(MnO_4^-\) ion in the following reaction is \(4.56 \times 10^{-3}\, Ms^{-1}\) \(2MnO_4^ - + 10{I^ - } + 16{H^ + } \to 2M{n^{2 + }} + 5{I_2} + 8{H_2}O\) The rate of appearance \(I_2\) is......\(\times {10^{ - 2}}\,M{s^{ - 1}}\)JEE Mains 2013 Hard
- In which of the following complexes the CFSE, \(\Delta_{\mathrm{o}}\) will be equal to zero?JEE Mains 2025 Medium
- The equilibrium constant at \(298\, K\) for a reaction \(A + B \rightleftharpoons C + D\) is \(100.\) If the initial concentration of all the four species were \(1\, M\) each, then equilibrium concentration of \(D\) ( in \(mol\, L^{-1}\) ) will be :JEE Mains 2016 Hard
- A common example of alpha decay is \({ }_{82}^{238} U \longrightarrow{ }_{80}^{234} Th +{ }_2 He ^4+ Q\). ( Given : \({ }_{92}^{238} U =238.05060 u ,\) \({ }_{90}^{234} Th =234.04360 u ,\) \({ }_2^4 He =4.00260 u \text {, and }\) \(1 u =931.5 \frac{ MeV }{ c ^2} )\). The energy released \((Q)\) during the alpha decay of \({ }_{92}^{238} U\) is \(......\,MeV\)JEE Mains 2023 Medium
- The mean and the median of the following ten numbers in increasing order \(10, 22, 26, 29, 34, x, 42, 67, 70, y\) are \(42\) and \(35\) respectively, then \(\frac{y}{x}\) is equal toJEE Mains 2019 Hard
- In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case...JEE Mains 2025 Medium