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MCQ (Single Correct Answer)

NEET 2023 Manipur
The $$\mathrm{E}^{\Theta}$$ values for $$\begin{aligned} & \mathrm{Al}^{+} / \mathrm{Al}=+0.55 \mathrm{~V} \text { and } \mathrm{Tl}^{+} / \mathrm{Tl}...
NEET 2023 Manipur
Molar conductance of an electrolyte increase with dilution according to the equation: $$\Lambda_{\mathrm{m}}=\Lambda_{\mathrm{m}}^{\circ}-\mathrm{A} \...
NEET 2023 Manipur
The correct value of cell potential in volt for the reaction that occurs when the following two half cells are connected, is $$\begin{aligned} & \math...
NEET 2023
The conductivity of centimolar solution of $$\mathrm{KCl}$$ at $$25^{\circ} \mathrm{C}$$ is $$0.0210 ~\mathrm{ohm}^{-1} \mathrm{~cm}^{-1}$$ and the re...
NEET 2023
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A : In equation $$\mathrm{\Delta_rG=-n...
NEET 2022 Phase 2
Two half cell reactions are given below. $$C{o^{3 + }} + {e^ - } \to C{o^{2 + }},\,\,\,\,\,\,\,\,\,E_{C{o^{2 + }}/C{o^{3 + }}}^0 = - 1.81\,V$$ $$2A{l...
NEET 2022 Phase 2
Standard electrode potential for the cell with cell reaction Zn(s) + Cu2+(aq) $$\to$$ Zn2+(aq) + Cu(s) is 1.1 V. Calculate the standard Gibbs energy c...
NEET 2022 Phase 1
At 298 K, the standard electrode potentials of Cu2+ / Cu, Zn2+ / Zn, Fe2+ / Fe and Ag+ / Ag are 0.34 V, $$-$$0.76 V, $$-$$0.44 V V and 0.80 V, respect...
NEET 2022 Phase 1
Given below are half cell reactions: $$MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{2 + }} + 4{H_2}O$$, $$E_{M{n^{2 + }}/MnO_4^ - }^o = - 1.510\,V$$ $${1...
NEET 2022 Phase 1
Find the emf of the cell in which the following reaction takes place at 298 K Ni(s) + 2Ag+ (0.001 M) $$\to$$ Ni2+ (0.001 M) + 2Ag(s) (Given that E$$_{...
NEET 2021
The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol$$-$$1 respectively. The molar conductance o...
NEET 2021
The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol$$-$$1. What is the dissociation constant of acetic acid? Choose the correct option.[$$\L...
NEET 2020 Phase 1
On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be :
NEET 2020 Phase 1
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol-1) is :
NEET 2019
For a cell involving one electron $$E_{cell}^\Theta $$ = 0.59 V at 298 K, the equilibrium constant for the cell reaction is : [Given that $${{2.303RT}...
NEET 2019
For the cell reaction 2Fe3+(aq) + 2I– (aq) $$ \to $$ 2Fe2+(aq) + I2(aq) $${E_{cell}^\Theta }$$ = 0.24 V at 298 K. The standard Gibbs energy ($$\Delta ...
NEET 2018
Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram : Then the species undergoing d...
NEET 2017
In the electrochemical cell : $$Zn\left| {ZnS{O_4}\left( {0.01\,M} \right)} \right|$$$$\left| {CuS{O_4}\left( {1.0M} \right)} \right|Cu,$$ the emf of ...
NEET 2016 Phase 2
The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 $$ \times $$ 10$$-$$3 S cm$$-$$1 at 298 K is ...
NEET 2016 Phase 2
If the Eocell for a given reaction has a negative value, which of the following gives the correct relationships for the values of $$\Delta $$Go and Ke...
NEET 2016 Phase 2
During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is
NEET 2016 Phase 2
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because
NEET 2016 Phase 2
The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 $$ \times $$...
NEET 2016 Phase 1
The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298 K is
AIPMT 2015
Aqueous solution of which of the following compounds is the best conductor of electric current ?
AIPMT 2015 Cancelled Paper
A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as
AIPMT 2014
When 0.1 mol MnO$$_4^{2 - }$$ is oxidised the quantity of electricity required to completely oxidise MnO$$_4^{2 - }$$ to MnO$$_4^ - $$ is
AIPMT 2014
The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be
NEET 2013 (Karnataka)
Consider the half-cell reduction reaction Mn2+ + 2e$$-$$ $$ \to $$ Mn, Eo = $$-$$1.18 V Mn2+ $$ \to $$ Mn3+ + e$$-$$, Eo = $$-$$ 1.51 V The $$E$$o f...
NEET 2013 (Karnataka)
How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (...
NEET 2013
A button cell used in watches function as following. Zn(s) + Ag2O(s) + H2O(l) $$\rightleftharpoons$$ 2Ag(s) + Zn2+(aq) + 2OH$$-$$(aq) If half cell p...
NEET 2013
At 25oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm$$-$$1 cm2 mol$$-$$1 and at infinite dilution its molar condu...
NEET 2013
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one ...
AIPMT 2012 Mains
Standard reduction potentials of the half reactions are given below : F2(g) + 2e$$-$$ $$ \to $$ 2F$$-$$(aq) ;   Eo = + 2.85 V Cl2(g) + 2e...
AIPMT 2012 Mains
The Gibb's energy for the decomposition of Al2O3 at 500oC is as follows $${2 \over 3}$$ Al2O3 $$ \to $$ $${4 \over 3}$$ Al + O2 $$\Delta $$rG = +960...
AIPMT 2012 Mains
Molar conductivities $$\left( {\Lambda _m^o} \right)$$ at infinite dilution of NaCl, Hcl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol$$-$$1 respec...
AIPMT 2012 Prelims
Limiting molar conductivity of NH4OH $$\left[ {} \right.$$i.e.  $$\Lambda _{m\left( {N{H_4}OH} \right)}^0$$$$\left. {} \right]$$ is equal to...
AIPMT 2011 Mains
A solution contains Fe2+, Fe3+ and I$$-$$ ions. This solution was treated with iodine at 35oC. Eo for Fe3+/Fe2+ is + 0.77 V and Eo for I2/2I$$-$$ = 0...
AIPMT 2011 Prelims
Standard electrode potential of three metals X, Y and Z are $$-$$1.2 V, + 0.5 V and $$-$$ 3.0 V respectively. The reducing power of these metals will ...
AIPMT 2011 Prelims
Standard electrode potential for Sn4+/Sn2+ couple is + 0.15 V and that for the Cr3+/Cr couple is $$-$$ 0.74 V. These two couples in their standard sta...
AIPMT 2011 Prelims
The electrode potentials for Cu2+(aq) + e$$-$$ $$ \to $$ Cu+(aq) and Cu+(aq) + e$$-$$ $$ \to $$ Cu(s) are + 0.15 V and + 0.50 V respectively. The v...
AIPMT 2010 Mains
Which of the following expressions correctly represents the equivalent conductance at infinite diluation of Al2(SO4)3. Given that $$\mathop \Lambda \l...
AIPMT 2010 Mains
Consider the following relations for emf of an electrochemical cell (i)   EMF of cell = (Oxidation potential of anode) $$-$$ (Reduction pote...
AIPMT 2010 Prelims
For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25oC. The value of standard Gibb's energy,...
AIPMT 2010 Prelims
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
AIPMT 2009
Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 $$ \times $$ 104 amperes of current is passed through molten Al2O3 for 6 ...
AIPMT 2009
The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant...
AIPMT 2009
Given : (i)   Cu2+ + 2e$$-$$ $$ \to $$ Cu,  Eo = 0.337 V (ii)  Cu2+ + e$$-$$ $$ \to $$ Cu+,  Eo = 0.153 V Ele...
AIPMT 2008
On the basis of the following Eo values, the strongest oxidizing agent is [Fe(CN)6]4$$-$$ $$ \to $$ [Fe(CN)6]3$$-$$ + e$$-$$;  Eo = $$-$$0....
AIPMT 2008
Standard free energies of formation (in kJ/mol) at 298 K are $$-$$237.2, $$-$$ 394.4 and $$-$$8.2 for H2O(l), CO2(g) and pentane (g) respectively. The...
AIPMT 2008
Kohlrausch's law states that at
AIPMT 2007
The equilibrium constant of the reaction: Cu(s) + 2Ag+(aq) $$ \to $$ Cu2+(aq) + 2Ag(s); Eo = 0.46 V at 298 K is ...
AIPMT 2007
The efficiency of a fuel cell is given by
AIPMT 2006
EoFe2+/Fe = $$-$$ 0.441 V and EoFe3+/Fe2+ = 0.771 V, the standard EMF of the reaction Fe + 2Fe3+ $$ \to $$ 3Fe2+ will be...
AIPMT 2006
A hypothetical electrochemical cell is shown below. $$A\left| {{A^ + }\left( {xM} \right)} \right|\left| {{B^ + }\left( {yM} \right)} \right|B$$ The e...
AIPMT 2005
4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produ...
AIPMT 2005
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (At...
AIPMT 2004
The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25oC. The equilibrium constant of the reaction wou...
AIPMT 2003
The e.m.f. of a Daniell cell at 298 K is E1. When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is ...
AIPMT 2003
On the basis of the information available from the reaction, 4/3Al + O2 $$ \to $$ 2/3Al2O3,   $$\Delta $$G = $$-$$ 827 kJ mol$$-$$1 of O2, ...
AIPMT 2002
In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam
AIPMT 2001
Standard electrode potentials are Fe2+/Fe [Eo = $$-$$0.44] and Fe3+/Fe2+[ Eo = 0.77]; If Fe2+, Fe3+ and Fe blocks are kept together, then ...
AIPMT 2000
Cell reaction is spontaneous when
AIPMT 2000
Equivalent conductances of Ba2+ and Cl$$-$$ ions are 127 and 76 ohm$$-$$1 cm$$-$$1 eq$$-$$1 respectively. Equivalent conductance of BaCl2 at infinite ...
AIPMT 2000
For the disproportionation of copper 2Cu+  $$ \to $$ Cu2+ + Cu, Eo is (Given Eo for Cu2+/Cu is 0.34 V and Eo for Cu2+/Cu+ is 0.15 V.)...
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