1
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Calculate the standard cell potential in (V) of the cell in which following reaction takes place : Fe2+(aq) + Ag+(aq) $$ \to $$ Fe3+(aq) + Ag (s)

Given that
$$E_{A{g^ + }/Ag}^o = xV$$
$$E_{Fe^{2+ }/Fe}^o = yV$$
$$E_{Fe^{3+ }/Fe}^o = zV$$
A
x + 2y - 3z
B
x - z
C
x - y
D
x + y - z
2
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Given that $${E^\Theta }_{{O_2}/{H_2}O} = 1.23\,V$$ ;
$${E^\Theta }_{{S_2}O_8^{2 - }/SO_4^{2 - }} = 2.05\,V$$
$${E^\Theta }_{B{r_2}/B{r^ - }} = 1.09\,V$$
$${E^\Theta }_{A{u^{3 + }}/Au} = 1.4\,V$$

The strongest oxidizing agent is :
A
O2
B
Au3+
C
Br2
D
$${S_2}O_8^{2 - }$$
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
$$ \wedge _m^ \circ $$ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm2 mol–1, respectively. If the conductivity of 0.001 M HA is-

5 $$ \times $$ 10–5 S cm–1, degree of dissociation of HA is -
A
0.50
B
0.125
C
0.25
D
0.75
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Given

(i)  C (graphite) + O2(g) $$ \to $$ CO2(g); $$\Delta $$rH$$^\Theta $$ = x kJ mol$$-$$1

(ii)  C(graphite) + $${1 \over 2}$$O2(g) $$ \to $$ CO2(g); $$\Delta $$rH$$^\Theta $$ = y kJ mol$$-$$1

(iii)  CO(g) + $${1 \over 2}$$ O2(g) $$ \to $$ CO2(g); $$\Delta $$rH$$^\Theta $$ = z kJ mol$$-$$1

Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct ?
A
z = x + y
B
x = y + z
C
x = y – z
D
y = 2z – x
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