MCQ
The metal complex that is diamagnetic is (Atomic number: Fe, 26; Cu, 29)
- ✓$K _3\left[ Cu ( CN )_4\right]$
- B$K _2\left[ Cu ( CN )_4\right]$
- C$K _3\left[ Fe ( CN )_4\right]$
- D$K _4\left[ FeCl _6\right]$
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$\mathrm{MnO}_{4}^{-}+\mathrm{C}_{2} \mathrm{O}_{4}^{2-}+\mathrm{H}^{+} \longrightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$
the correct coefficients of the reactants for the balanced equation are
$\mathrm{MnO}_{4}^{-} \quad \mathrm{C}_{2} \mathrm{O}_{4}^{2-}\quad \mathrm{H}^{+}$
Reason : Transparent bead $(NaBO_2 + B_2O_3)$ forms coloured bead with coloured cation.