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Anhydrous ferric chloride cannot be obtained by heating hydrated ferric chloride alone

Silver containing lead as impurity is purified by cupellation

Ferric chloride solution gives a deep green precipitate on adding ${\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$

The bond length order of the $\mathrm{B}-\mathrm{N}$ bond in the following compounds:

HB(NR₂)₂, H₂B(NR₂) and B(NR₂)₃ is

B(NR₂)₃ > HB(NR₂)₂ > H₂B(NR₂) (R-methyl group)