MCQ
The ${H^ + }$ ion concentration is $1.0 \times {10^{ - 6}}$ mole/litre in a solution. Its $pH $ value will be
- A$12$
- ✓$6$
- C$18$
- D$24$
$pH = - \,\log \,\,[1.00 \times {10^{ - 6}}]$; $pH = 6.$
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$E^o_{Cr^{3+}/Cr} =-0.74\, V,\,$ $E^o_{MnO_4^-/Mn^{2+}} =1.51 \,V$
$E^o_{Cr_2O_7^{2-}/Cr^3+} =1.33\,V:$ $E^o_{Cl/Cl^-} =1.36\,V$
Based on the data given above, strongest oxidising agent will be :
$Image$
| $A/mol\,L^{-1}$ | $0.2$ | $0.2$ | $0.4$ |
| $B/mol\,L^{-1}$ | $0.3$ | $0.1$ | $0.05$ |
| $r_0/mol^{-1}s^{-1}$ | $5.0\times 10^{-5}$ | $5.0\times 10^{-5}$ | $1.4\times 10^{-4}$ |
Reason : Orbital motion contributes magnetic moment.