1
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Preparation of Bakelite proceeds via reactions.
A
Electrophilic substitution and dehydration
B
Condensation and elimination
C
Nucleophilic addition and dehydration
D
Electrophilic addition and dehydration
2
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct order of the calculated spin-only magnetic moments of complexs (A) to (D) is:
(A) Ni(CO)4
(B) [Ni(H2O)6]Cl2
(C) Na2[Ni(CN)4]
(D) PdCl2(PPh3)2
A
(C) < (D) < (B) < (A)
B
(C) $$ \approx $$ (D) < (B) < (A)
C
(A) $$ \approx $$ (C) $$ \approx $$ (D) < (B)
D
(A) $$ \approx $$ (C) < (B) $$ \approx $$ (D)
3
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
For the following Assertion and Reason, the correct option is
Assertion : For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason : The reactants are most strongly adsorbed on group 7-9 elements.
A
Both assertion and reason are true and the reason is the correct explanation for the assertion.
B
The assertion is true, but the reason is false.
C
Both assertion and reason are true but the reason is not the correct explanation for the assertion.
D
Both assertion and reason are false.
4
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
Change Language
For an electrochemical cell

Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s)

the ratio $${{\left[ {S{n^{2 + }}} \right]} \over {\left[ {P{b^{2 + }}} \right]}}$$ when this cell attains equilibrium is _________.

(Given $$E_{S{n^{2 + }}|Sn}^0 = - 0.14V$$,

$$E_{P{b^{2 + }}|Pb}^0 = - 0.13V$$, $${{2.303RT} \over F} = 0.06$$)
Your input ____
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