1
JEE Main 2021 (Online) 24th February Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The electrode potential of M2+/M of 3d-series elements shows positive value for :
A
Zn
B
Fe
C
Cu
D
Co
2
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
For the given cell :

Cu(s) | Cu2+(C1M) || Cu2+(C2M) | Cu(s)

change in Gibbs energy ($$\Delta $$G) is negative, if
A
C2 = $$\sqrt 2 $$C1
B
C2 = $${{{C_1}} \over {\sqrt 2 }}$$
C
C1 = 2C2
D
C1 = C2
3
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution is shown in the given figure. JEE Main 2020 (Online) 5th September Evening Slot Chemistry - Electrochemistry Question 65 English
The electrolyte X is :
A
HCl
B
CH3COOH
C
NaCl
D
KNO3
4
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO3 and 0.1 M AuCl. The solution was electrolyzed at 2V by passing a current of 1A for 15 minutes. The metal/metals electrodeposited will be

[ $$E_{A{g^ + }/Ag}^0$$ = 0.80 V, $$E_{A{u^ + }/Au}^0$$ = 1.69 V ]
A
Silver and gold in equal mass proportion
B
Silver and gold in proportion to their atomic weights
C
Only gold
D
Only silver
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