Q. Given :
$\mathrm{E}_{\mathrm{Fe}^{-3} / \mathrm{Fe}}^{\circ}=-0.036 \mathrm{V}, \quad \mathrm{E}_{\mathrm{Fe}^{-2} / \mathrm{Fe}}^{\circ}=-0.439 \mathrm{V}$. The value of standard electrode potential for the change.
$\mathrm{Fe}^{+3}_{(\mathrm{aq})}+\mathrm{e}^{-} \longrightarrow \mathrm{Fe}^{+2}_{(\mathrm{aq})}$ will be :-
(1) 0.770 V (2) –0.27 V (3) –0.072 V (4) 0.385 V
AIEEE 2009
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Sol. (1) $\mathrm{E}^{\circ}=\frac{3 \times-0.036+2 \times 0.439}{1}=0.77 \Rightarrow \mathrm{A}$
Q. The Gibbs energy for the decomposition of $\mathrm{Al}_{2} \mathrm{O}_{3}$ at $500^{\circ} \mathrm{C}$ is as follows :
$\frac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3} \longrightarrow \frac{4}{3} \mathrm{Al}+\mathrm{O}_{2}, \mathrm{AG}=+966 \mathrm{KJ} \mathrm{mol}^{-1}$ The potential difference needed for electrolytic reduction of $\mathrm{Al}_{2} \mathrm{O}_{3}$ at $500^{\circ} \mathrm{C}$ is at least :-
(1) 5.0 V (2) 4.5 V (3) 3.0 V (4) 2.5 V
AIEEE 2010
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Sol. (4) $966 \times 10^{3}=4 \times 96500 \times \mathrm{E} \Rightarrow \mathrm{E}=2.5 \mathrm{V}$
Q. Resistance of 0.2 M solution of an electrolyte is $50 \Omega$. The specific conductance of the solution is 1.3 S $\mathrm{m}^{-1}$. If resistance of the 0.4M solution of the same electrolyte is $260 \Omega$, its molar conductivity is :-
(1) $6250 \mathrm{Sm}^{2} \mathrm{mol}^{-1}$
(2) $6.25 \times 10^{-4} \mathrm{S} \mathrm{m}^{2} \mathrm{mol}^{-1}$
(3) $625 \times 10^{-4} \mathrm{S} \mathrm{m}^{2} \mathrm{mol}^{-1}$
(4) $62.5 \mathrm{S} \mathrm{m}^{2} \mathrm{mol}^{-1}$
AIEEE 2011/JEE-MAIN 2014
Q. The reduction potential of hydrogen half-cell will be negative if :-
(1) $\mathrm{p}\left(\mathrm{H}_{2}\right)=2 \operatorname{atm}\left[\mathrm{H}^{+}\right]=1.0 \mathrm{M}$
(2) $\mathrm{p}\left(\mathrm{H}_{2}\right)=2$ atm and $\left[\mathrm{H}^{+}\right]=2.0 \mathrm{M}$
(3) $\mathrm{p}\left(\mathrm{H}_{2}\right)=1$ atm and $\left[\mathrm{H}^{+}\right]=2.0 \mathrm{M}$
(4) $\mathrm{p}\left(\mathrm{H}_{2}\right)=1$ atm and $\left[\mathrm{H}^{+}\right]=1.0 \mathrm{M}$
AIEEE 2011
Q. The standard reduction potentials for $\mathrm{Zn}^{2+} / \mathrm{Zn}, \mathrm{Ni}^{2+} / \mathrm{Ni}$ and $\mathrm{Fe}^{2+} / \mathrm{Fe}$ are $-0.76,-0.23$ and – 0.44 V respectively. The reaction $\mathrm{X}+\mathrm{Y}^{+2} \rightarrow \mathrm{X}^{2+}+\mathrm{Y}$ will be spontaneous when
(1) X = Zn, Y = Ni
(2) X = Ni, Y = Fe
(3) X = Ni, Y = Zn
(4) X = Fe, Y = Zn
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Sol. (1) For spontaneous reaction $\mathrm{E}^{\circ}>0 \mathrm{so}(\mathrm{A})$
Q. Given :
Based on the data given above, strongest oxidising agent will be :
(1) Cl–
(2) $\mathrm{Cr}^{3+}$
(3) $\mathrm{Mn}^{2+}$
(4) $\mathrm{MnO}_{4}^{-}$
JEE-Mains 2013
Based on the data given above, strongest oxidising agent will be :
(1) Cl–
(2) $\mathrm{Cr}^{3+}$
(3) $\mathrm{Mn}^{2+}$
(4) $\mathrm{MnO}_{4}^{-}$
JEE-Mains 2013
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Sol. (4) Higher the SRP, stronger will be oxidising agent Hence, $\mathrm{MnO}_{4}^{-}$ is stronger oxidising agent.
Q. The equivalent conductance of NaCl at concentration C and at infinite dilution are $\lambda_{\mathrm{C}}$ and $\lambda_{\infty}$ , respectively. The correct relationship between $\lambda_{\mathrm{C}}$ and $\lambda_{\infty}$ is given as:
(1) $\lambda_{\mathrm{C}}=\lambda_{\infty}-(\mathrm{B}) \sqrt{\mathrm{C}}$
(2) $\lambda_{\mathrm{C}}=\lambda_{\infty}+(\mathrm{B}) \sqrt{\mathrm{C}}$
(3) $\lambda_{\mathrm{C}}=\lambda_{\infty}+(\mathrm{B}) \mathrm{C}$
(4) $\lambda_{\mathrm{C}}=\lambda_{\infty}-(\mathrm{B}) \mathrm{C}$
JEE-Mains 2014
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Sol. (1) Fact
Q. At 298 K, the standard reduction potentials are 1.51 V for $\mathrm{MnO}_{4}-| \mathrm{Mn}^{2+}$ , 1.36 V for $\mathrm{Cl}_{2} | \mathrm{Cl}^{-}$, 1.07 V for $\mathrm{Br}_{2} | \mathrm{Br}^{-},$ and $0.54 \mathrm{V}$ for $\mathrm{I}_{2} | \mathrm{I}^{-} .$ At $\mathrm{pH}=3$, permanganate is expected to oxidize $\left(\frac{\mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{V}\right):-$
(1) $\mathrm{Cl}^{-}$ and $\mathrm{Br}^{-}$
(2) $\mathrm{Cl}^{-}, \mathrm{Br}^{-}$ and $\mathrm{I}^{-}$
(3) $\mathrm{Br}^{-}$ and $\mathrm{I}^{-}$
(4) I- only
JEE-Mains (online) 2015
Q. A variable, opposite external potential $\left(\mathrm{E}_{\mathrm{ext}}\right)$ is applied to the cell
$\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M}) \| \mathrm{Cu}^{2+}(1 \mathrm{M})\right| \mathrm{Cu}$, of potential 1.1 V. When $\mathrm{E}_{\mathrm{ext}}<1.1 \mathrm{V}$ and $\mathrm{E}_{\mathrm{ext}}>1.1 \mathrm{V}$ , respectively electrons flow from :
(1) anode to cathode in both cases
(2) anode to cathode and cathode to anode
(3) cathode to anode in both cases
(4) cathode to anode and anode to cathode
JEE-Mains (online) 2015
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Sol. (2) Fact
Q. Two Faraday of electricity is passed through a solution of $\mathrm{CuSO}_{4}$. The mass of copper deposited at the cathode is :
(at. mass of Cu = 63.5 amu)
(1) 2g (2) 127 g (3) 0 g (4) 63.5 g
JEE-Mains 2015
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Sol. (4) $2 \mathrm{F}=2 \mathrm{eq}=1$ mole $=63.5 \mathrm{gm}$
Q. Galvanization is applying a coating of :-
(1)Zn (2) Pb (3) Cr (4) Cu
JEE-Mains 2016
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Sol. (1) Galvanization is the process of applying a protective zinc coating of steel or iron, to prevent rusting.
Q. Given
(1)Cr
(2) $\mathrm{Mn}^{2+}$
(3) $\mathrm{Cr}^{3+}$
(4) $\mathrm{Cl}^{-}$
JEE-Mains 2017
(1)Cr
(2) $\mathrm{Mn}^{2+}$
(3) $\mathrm{Cr}^{3+}$
(4) $\mathrm{Cl}^{-}$
JEE-Mains 2017
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Sol. (1)
Since $\mathrm{Cr}^{+3}$ is having least reducing potential, so Cr is the best Reducing agent.
Q. How long (approximate) should water be electrolysed by passing through 100
amperes current so that the oxygen released can completely burn 27.66 g of diborane ?
(Atomic weight of B = 10.8 u)
(1)0.8 hours
(2) 3.2 hours
(3) 1.6 hours
(4) 6.4 hours
JEE-Mains 2018
can u plz post more questions for preparation
3rd question is full of mistakes…………………………………
need more questions and more detailed solutions on every problem.
questions are good enough
more questions and latest questions
Need detailed solutions
Thanks
plz make it better
Please add questions of 2019 and 2020 as well
Still more questions are required plz add questions of 2019 and 20 questions in it…. And also provide detail solutions
Sir , I want to purchase previous years IIT JEE Chapter wise. Chemistry Questions with solution, you have any book for this pl confirm & cost of book
Helpful
Plz bro questions are dope but i need clr solutions even i cant solve it
clear solutions required
Clear solutions required
Clear solutions required
Need more questions for practice
Need some more questions 😎😎😎😎 plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
Can u provide clear solutions
Chill bro
Excellent
Very nice
👌👌