JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
How many electrons would be required to deposit \(6.35\,g\) of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate? (Atomic mass of copper \(= 63.5\,u,\) \(N_A=\) Avogadro's constant)
- A \(\frac{{{N_A}}}{{20}}\)
- B \(\frac{{{N_A}}}{{10}}\)
- C \(\frac{{{N_A}}}{{5}}\)
- D \(\frac{{{N_A}}}{{2}}\)
Answer & Solution
Correct Answer
(C) \(\frac{{{N_A}}}{{5}}\)
Step-by-step Solution
Detailed explanation
\(Cu\, \to \,C{u^{ + + }}\, + \,2{e^ - }\) i.e., to deposit \(1\,mole\) of \(Cu\) at cathode from \(Cu^{2+}\) \(SO_4^{2-}\) solution \(=\,2\,\,mole\) of electrons are required i.e., To deposit…
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
- Example of a three-dimensional silicate isJEE Mains 2014 Medium
- Noradrenaline is a/anJEE Mains 2019 Hard
- The higher concentration of which gas in air can cause stiffness of flower buds?JEE Mains 2019 Medium
- The redox reaction among the following isJEE Mains 2020 Hard
- The values of \(K_p/K_c\) for the following reactions at \(300\, K\) are respectively (At \(300\, K, RT = 24.62\, dm^3\, atm \,mol^{-1}\)) \({N_2}(g) + {O_2}(g) \rightleftharpoons 2NO(g)\) \({N_2}{O_4}(g) \rightleftharpoons 2N{O_2}(g)\) \({N_2}(g) + 3{H_2}(g) \rightleftharpoons 2N{H_3}(g)\)JEE Mains 2019 Hard
- Given below are two statements :
Statement (\(\mathbf{I}\)): The radius of isoelectronic species increases in the order.
\(\mathrm{Mg}^{2+} \lt \mathrm{Na}^{+} \lt \mathrm{F}^{-} \lt \mathrm{O}^{2-}\)
Statement (II): The magnitude of electron gain enthalpy of halogen decreases in the order.
\(\mathrm{Cl}\gt\mathrm{F}\gt\mathrm{Br}\gt\mathrm{I}\)
In the light of the above statements, choose the most appropriate answer from the options given below :JEE Mains 2025 Easy
More PYQs from JEE Mains
- A direct current of \(4\,A\) and an alternating current of peak value \(4\,A\) flow through resistance of \(3\,\Omega\) and \(2\,\Omega\) respectively. The ratio of heat produced in the two resistances in same interval of time will be.JEE Mains 2022 Medium
- In the sulphur estimation, \(0.471\, \mathrm{~g}\) of an organic compound gave \(1.44\, \mathrm{~g}\) of barium sulphate. The percentage of sulphur in the compound is \(......\%\). (Nearest integer) (Atomic Mass of \(\mathrm{Ba}=137 \,\mathrm{u})\)JEE Mains 2021 Medium
- Anomalous behaviour of oxygen is due to its _______.JEE Mains 2024 Hard
- A solution is \(0.1\, \mathrm{M}\) in \(\mathrm{Cl}^{-}\)and \(0.001\, \mathrm{M}\) in \(\mathrm{CrO}_{4}{ }^{2-}\). Solid \(\mathrm{AgNO}_{3}\) is gradually added to it. Assuming that the addition does not change in volume and \(\mathrm{K}_{\mathrm{sp}}(\mathrm{AgCl})=1.7 \times 10^{-10} \,\mathrm{M}^{2}\) and \(\mathrm{K}_{\mathrm{sp}}\left(\mathrm{Ag}_{2} \mathrm{CrO}_{4}\right)=1.9 \,\times 10^{-12} \mathrm{M}^{3}\) Select correct statement from the following :JEE Mains 2021 Hard
- A capacitor \(C _{1}\) of capacitance \(5\,\mu F\) is charged to a potential of \(30\,V\) using a battery. The battery is then removed and the charged capacitor is connected to an uncharged capacitor \(C _{2}\) of capacitance \(10\,\mu F\) as shown in figure. When the switch is closed charge flows between the capacitors. At equilibrium, the charge on the capacitor \(C _{2}\) is________ \(\mu C\)
JEE Mains 2022 Hard - A carbon resistance has a following colour code. What is the value of the resistance?
JEE Mains 2019 Medium