JEE Main 2022 (Online) 28th July Morning Shift | Electrochemistry Question 61 | Chemistry

1

JEE Main 2022 (Online) 28th July Morning Shift

MCQ (Single Correct Answer)

+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

MCQ (Single Correct Answer)

+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

MCQ (Single Correct Answer)

+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

MCQ (Single Correct Answer)

+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

$${1 \over 2}{F_2}\,|{F^ - }$$