1
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
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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 $$E_{S{n^{2 + }}|Sn}^0 = - 0.14V$$,

$$E_{P{b^{2 + }}|Pb}^0 = - 0.13V$$, $${{2.303RT} \over F} = 0.06$$)
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2
JEE Main 2020 (Online) 8th January Morning Slot
Numerical
+4
-0
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What would be the electrode potential for the given half cell reaction at pH = 5? ______.

2H2O $$ \to $$ O2 + 4H$$ \oplus $$ + 4e ; $$E_{red}^0$$ = 1.23 V

(R = 8.314 J mol–1 K–1 ; Temp = 298 k;

oxygen under std. atm. pressure of 1 bar)
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