1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Given

$$E_{C{r^{2 + }}/Cr}^o$$ = -0.74 V; $$E_{MnO_4^ - /M{n^{2 + }}}^o$$ = 1.51 V

$$E_{C{r_2}O_7^{2 - }/C{r^{3 + }}}^o$$ = 1.33 V; $$E_{Cl/C{l^ - }}^o$$ = 1.36 V

Based on the data given above, strongest oxidising agent will be :
A
Cr3+
B
Mn2+
C
$$MnO_4^ - $$
D
Cl-
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such a reaction will be:(R = 8.314 JK–1 mol–1 and log 2 = 0.301)
A
48.6 kJ mol–1
B
58.5 kJ mol–1
C
60.5 kJ mol–1
D
53.6 kJ mol–1
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Which of the following arrangements does not represent the correct order of the property stated against it?
A
Ni2+ < Co2+ < Fe2+ < Mn2+ : ionic size
B
Co3+ < Fe3+ < Cr3+ < Sc3+ : stability in aqueous solution
C
Sc < Ti < Cr < Mn : number of oxidation states
D
V2+ < Cr2+ < Mn2+ < Fe2+ : paramagnetic behaviour
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $$E_{{M^{3 + }}/{M^{2 + }}}^0$$ value?
A
Mn (Z = 25)
B
Fe (Z = 26)
C
Co (Z = 27)
D
Cr (Z = 24)
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