MCQ
$IUPAC$ name for $K\left[ {Ag{{\left( {CN} \right)}_2}} \right]$ is
- APotassium argentocyanide
- BPotassium silver cyanide
- ✓Potassium dicyanoargentate $ (I)$
- DPotassium dicyanosilver $(II)$
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(Given: Atomic no. $Eu, 63; Sm , 62 ; Tm , 69 ; Tb$, $65 ; Yb , 70 ; Dy , 66]$
$^{200}X \,:\, 90\%$ $^{199}X\, :\, 8.0\%$ $^{202}X\, :\, 2.0\%$
The weighted average atomic mass of the naturally occurring element $X$ is closest to......$amu$

