1
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
Change Language
Some standard electrode potentials at 298 K are given below :

Pb2+ /Pb $$-$$ 0.13 V

Ni2+ /Ni $$-$$ 0.24 V

Cd2+ /Cd $$-$$ 0.40 V

Fe2+ /Fe $$-$$ 0.44 V

To a solution containing 0.001 M of X2+ and 0.1 M of Y2+, the metal rods X and Y are inserted (at 298 K) and connected by a conducting wire. This resulted in dissolution of X. The correct combination(s) of X and Y, respectively, is(are)

(Given : Gas constant, R = 8.314 J K$$-$$ mol$$-$$1, Faraday constant, F = 96500 C mol$$-$$1)
A
Cd and Ni
B
Cd and Fe
C
Ni and Pb
D
Ni and Fe
2
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
Change Language
The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are)

(Note : py = pyridine)

Given : Atomic numbers of Fe, Co, Ni and Cu are 26, 27, 28 and 29, respectively)
A
[FeCl4]$$-$$ and [Fe(CO)4]2$$-$$
B
[Co(CO)4]$$-$$ and [CoCl4]2$$-$$
C
[Ni(CO)4] and [Ni(CN)4]2$$-$$
D
[Cu(py)4]+ and [Cu(CN)4]3$$-$$
3
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
Change Language
The correct statement(s) related to oxoacids of phosphorous is(are)
A
Upon heating, H3PO3 undergoes disproportionation reaction to produce H3PO4 and PH3.
B
While H3PO3 can act as reducing agent, H3PO4 cannot.
C
H3PO3 is a monobasic acid.
D
The H atom of P-H bond in H3PO3 is not ionizable in water.
4
JEE Advanced 2021 Paper 2 Online
Numerical
+2
-0
Change Language
At 298 K, the limiting molar conductivity of a weak monobasic acid is 4 $$\times$$ 102 S cm2 mol$$-$$1. At 298 K, for an aqueous solution of the acid the degree of dissociation is $$\alpha$$ and the molar conductivity is y $$\times$$ 102 S cm2 mol$$-$$1. At 298 K, upon 20 times dilution with water, the molar conductivity of the solution becomes 3y $$\times$$ 102 S cm2 mol$$-$$1.

The value of $$\alpha$$ is __________.
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