- AThe formation of $Ni{(CO)_4}$
- BThe decomposition of $Ni{(CO)_4}$
- ✓The formation and thermal decomposition of $Ni{(CO)_4}$
- DThe formation and catalytic decomposition of $Ni{(CO)_4}$
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$(I)$ both the complexes can be high spin
$(II)$ $Ni(II)$ complex can very rarely be low spin.
$(III)$ with strong field ligands, $Mn(II)$ complexes can be low spin.
$(IV)$ aqueous solution of $Mn ( II )$ ions is yellow in color.
(Round off to the Nearest Integer)

Assertion $(A)$ : Haloalkanes react with $\mathrm{KCN}$ to form alkyl cyanides as a main product while with $\mathrm{AgCN}$ form isocyanide as the main product.
Reason $(R)$ : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both are highly ionic compounds.
In the light of the above statement, choose the most appropriate answer from the options given below:
${X_{\left( s \right)}} + Y_{\left( {aq} \right)}^{ + 2} \rightleftharpoons {Y_{\left( s \right)}} + X_{\left( {aq} \right)}^{2 + }$
Given :
$E_{{x^{ + 2}}/x}^o = - 1.36\,volt$ ;
$E_{{y^{ + 2}}/y}^o = - 0.76\,volt\,\frac{{2.303\,RT}}{F} = 0.06$
