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  4. Nickel (II) ion forms a complex K x[ Ni ( CN )4]. The value of ' x ' is.

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Q. Nickel $(II)$ ion forms a complex $K _{x}\left[ Ni ( CN )_{4}\right]$. The value of ' $x$ ' is______.

Coordination Compounds

Solution:

Charge on complex ion $=+2+4 \times(-1)=-2$
$\therefore $ Two $K ^{+}$ions are required to balance the charge on the complex ion.
$\therefore $ Formula of complex is $K _{2}\left[ Ni ( CN )_{4}\right]$.
$\therefore $ The value of ' $x$ ' is $2$ .