1
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The standard electrode potential $$\mathrm{(M^{3+}/M^{2+})}$$ for V, Cr, Mn & Co are $$-$$0.26 V, $$-$$0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate $$\mathrm{H_2}$$ from a dilute acid are :

A
$$\mathrm{Mn^{2+}}$$ and $$\mathrm{Co^{2+}}$$
B
$$\mathrm{V^{2+}}$$ and $$\mathrm{Mn^{2+}}$$
C
$$\mathrm{V^{2+}}$$ and $$\mathrm{Cr^{2+}}$$
D
$$\mathrm{Cr^{2+}}$$ and $$\mathrm{Co^{2+}}$$
2
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

A
JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 31 English Option 1
B
JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 31 English Option 2
C
JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 31 English Option 3
D
JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 31 English Option 4
3
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

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
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