1
JEE Main 2022 (Online) 28th July Morning Shift
+4
-1

Match List - I with List - II.

List - I List - II
(A) $$Cd(s) + 2Ni{(OH)_3}(s) \to CdO(s) + 2Ni{(OH)_2}(s) + {H_2}O(l)$$ (I) Primary battery
(B) $$Zn(Hg) + HgO(s) \to ZnO(s) + Hg(l)$$ (II) Discharging of secondary battery
(C) $$2PbS{O_4}(s) + 2{H_2}O(l) \to Pb(s) + Pb{O_2}(s) + 2{H_2}S{O_4}(aq)$$ (III) Fuel cell
(D) $$2{H_2}(g) + {O_2}(g) \to 2{H_2}O(l)$$ (IV) Charging of secondary battery

Choose the correct answer from the options given below:

A
$$(\mathrm{A})-(\mathrm{I}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{IV})$$
B
$$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{II}),(\mathrm{D})-(\mathrm{III})$$
C
$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{III})$$
D
$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{IV})$$
2
JEE Main 2022 (Online) 27th July Evening Shift
+4
-1

Given below are two statements :

Statement I : For KI, molar conductivity increases steeply with dilution

Statement II : For carbonic acid, molar conductivity increases slowly with dilution

In the light of the above statements, choose the correct answer from the options given below :

A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is true but Statement II is false
D
Statement I is false but Statement II is true
3
JEE Main 2022 (Online) 25th July Evening Shift
+4
-1

The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is $${\Lambda _{m1}}$$ and that of 20 moles another identical cell heaving 80 mL NaCl solution is $${\Lambda _{m2}}$$. The conductivities exhibited by these two cells are same. The relationship between $${\Lambda _{m2}}$$ and $${\Lambda _{m1}}$$ is

A
$${\Lambda _{m2}}$$ = 2$${\Lambda _{m1}}$$
B
$${\Lambda _{m2}}$$ = $${\Lambda _{m1}}$$ / 2
C
$${\Lambda _{m2}}$$ = $${\Lambda _{m1}}$$
D
$${\Lambda _{m2}}$$ = 4$${\Lambda _{m1}}$$
4
JEE Main 2022 (Online) 30th June Morning Shift
+4
-1

In which of the following half cells, electrochemical reaction is pH dependent?

A
$$Pt\,|\,F{e^{3 + }},\,F{e^{2 + }}$$
B
$$MnO_4^ - \,|M{n^{2 + }}$$
C
$$Ag\,|\,AgCl\,|C{l^{ - 1}}$$
D
$${1 \over 2}{F_2}\,|{F^ - }$$
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