MCQ
Triple degenerate $d-$ orbitals are exactly half-filled in
- A$Co^{3+}$ (octahedral field , low spin)
- ✓$Co^{2+}$ (tetrahedral field)
- C$Co^{3+}$ (Octahedral field, high spin)
- D$Co^{2+}$ (square planar field)

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$Pt \left| H _{2}( g )\right| H ^{+}( aq ) \| Cu ^{2+}(0.01 M ) \mid Cu ( s )$
is $0.576 \,V$ at $298\, K$. The $pH$ of the solution is $......\,.$ (Nearest integer)

${C_6}{H_5}N{H_2}\mathop {\xrightarrow{{NaN{O_2}/HCl}}}\limits_{0 - 5\,^o C} X\mathop {\xrightarrow{{HN{O_2}}}}\limits_{C{H_2}O} Y + {N_2} + HCl$
$X$ and $Y$ are respectively