1
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$${\Lambda _{m1}}$$
2
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
$${1 \over 2}{F_2}\,|{F^ - }$$
3
JEE Main 2022 (Online) 27th June Evening Shift
+4
-1

In 3d series, the metal having the highest M2+/M standard electrode potential is

A
Cr
B
Fe
C
Cu
D
Zn
4
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1

The $${\left( {{{\partial E} \over {\partial T}}} \right)_P}$$ of different types of half cells are as follows:

A B C D
$$1 \times {10^{ - 4}}$$ $$2 \times {10^{ - 4}}$$ $$0.1 \times {10^{ - 4}}$$ $$0.2 \times {10^{ - 4}}$$

(Where E is the electromotive force)

Which of the above half cells would be preferred to be used as reference electrode?

A
A
B
B
C
C
D
D
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