1
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
For the following reaction,
$$2X + Y\buildrel k \over \longrightarrow P$$ the rate of reaction is $${{d[P]} \over {dt}} = k[X]$$. Two moles of X are mixed with one mole of Y to make 1.0 L of solution. At 50 s, 0.5 mole of Y is left in the reaction mixture. The correct statement(s) about the reaction is(are)

(Use : ln 2 = 0.693)
A
The rate constant, k, of the reaction is 13.86 $$\times$$ 10$$-$$4 s$$-$$1
B
Half-life of X is 50 s.
C
At 50 s, $$-$$$${{d[X]} \over {dt}}$$ = 13.86 $$\times$$ 10$$-$$3 mol L$$-$$1 s$$-$$1.
D
At 100 s, $$-$$$${{d[Y]} \over {dt}}$$ = 3.46 $$\times$$ 10$$-$$3 mol L$$-$$1 s$$-$$1.
2
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
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
3
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
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$$-$$
4
JEE Advanced 2021 Paper 2 Online
MCQ (More than One Correct Answer)
+4
-2
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.
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