MCQ
An, example for a double salt is
- APotassium ferricyanide
- BCobalt hexamine chloride
- CCuprous sulphate
- ✓Mohr’s salt
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${C_2}{H_5}Br\xrightarrow{X}{\text{product}}\xrightarrow{{\text{Y}}}{C_3}{H_7}N{H_2}$

$[Cr(NH_3)_6] [Cr(NO_2)_6]$ and $[Cr(NH_3)_4(NO_2)_2] \,[Cr(NH_3)_2(NO_2)_4]$