Electrochemistry - JEE Advanced PYQ | Last 5 years | PYQ Khazana

Описание: An aqueous solution of hydrazine (N2H4) is electrochemically oxidized by O2, thereby releasing
chemical energy in the form of electrical energy. One of the products generated from the
electrochemical reaction is N2(g).
Choose the correct statement(s) about the above process
(A)OH- ions react with N2H4 at the anode to form N2(g) and water, releasing 4 electrons to the anode.
(B)At the cathode, N2H4 breaks to N2(g) and nascent hydrogen released at the electrode reacts
with oxygen to form water.
(C)At the cathode, molecular oxygen gets converted to OH
(D)Oxides of nitrogen are major by-products of the electrochemical process.

In a conductometric titration, small volume of titrant of higher concentration is added stepwise to a
larger volume of titrate of much lower concentration, and the conductance is measured after each
addition.
The limiting ionic conductivity (Ao) values (in mS m2 mol-1) for different ions in aqueous solutions
are given below:
For different combinations of titrates and titrants given in List-I, the graphs of 'conductance'
versus 'volume of titrant' are given in List-II.
Match each entry in List-I with the appropriate entry in List-II and choose the correct option.

Plotting 1/Am against cAm for aqueous solutions of a monobasic weak acid (HX) resulted in a
straight line with y-axis intercept of P and slope of S. The ratio P/S is
[Am = molar conductivity
Am = limiting molar conductivity
c = molar concentration
Ka = dissociation constant of HX]

The reduction potential (E°, in V) of MnO4(aq)/Mn(s) is
[Given: Eº (Mn04(aq)/MnO2(s))= 1.68 V; Eº (MnO2(s)/Mn2+(aq))= 1.21 V; E(Mn2+(ag)/Mn(s)) =- 1.03 V ]

Consider the strong electrolytes (ZmXn, UmYp and VmXn). Limiting molar conductivity (Aº) of UmYp and VmXn are 250 and 440 S cm' mol, respectively. The value of (m + n + p) is __
Given: is the limiting molar conductivity of ions
The plot of molar conductivity (A) of ZmXn vs c1/2 is given below.
[R = gas constant, F = Faraday constant, T = Temperature]
(A) For the reaction, M(s) + 2H (aq) - H2(g) + M2(aq), if then the entropy change of the reaction is R (assume that entropy and internal energy changes are temperature independent).
B) The cell reaction, Pt(s) | H2(g, 1bar) | H (aq, 0.01M) || H'(aq, 0.1M) | H2(g, 1bar) | Pt(s), is an
entropy driven process.
For racemization of an optically active compound, △S 0.
(D) △S 0, for [Ni(H2O)6]2+ + 3 en - [Ni(en)3]2+ + 6H2O (where en = ethylenediamine).

At 298 K, the limiting molar conductivity of a weak monobasic acid is 4 x 102 S cm2 mol-1. At 298 K, for an aqueous solution of the acid the degree of dissociation of a and the molar conductivity is
y × 102 S cm² mol⁻¹. At 298 K, upon 20 times dilution with water, the molar conductivity of the solution becomes 3yx102 S cm² mol⁻¹.
The value of a is____.
The value of y is____.

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