Question

Match the complex ions given in column I with their colour given in column II and mark the appropriate choice.

Column I (Complex ion)		Column II (Colour)
$(A)$	$[Co{F}_6{]}^{3-}$	(i)	Blue-green
(B)	$[Co(N{H}_3{)}_6{]}^{3+}$	(ii)	Pale yellow
(C)	$[Co(H_{2}O{)}_6{]}^{3+}$	(iii)	Green
(D)	$[Co(CN{)}_6{]}^{3-}$	(iv)	Yellow-orange

• A. $(A)\to (iii),(B)\to (iv),(C)\to (i),(D)\to (ii)$
• B. $(A)\to (iii),(B)\to (iv),(C)\to (ii),(D)\to (i)$
• C. $(A)\to (i),(B)\to (iii),(C)\to (iv),(D)\to (ii)$
• D. $(A)\to (iv),(B)\to (i),(C)\to (iii),(D)\to (ii)$

Answer 1

Answer: (A)

${\left[Co{F}_6\right]}^{3-}\Rightarrow$ Green.
${\left[Co\left(N{H}_2\right)\right]}^{3+}\Rightarrow$ Yellow-Orange.
${\left[Co{\left(N{H}_2\right)}_6\right]}^{3+}\Rightarrow$ Yellow-Orange.
${\left[Co{\left(H_{2}O\right)}_6\right]}^{3+}\Rightarrow$ Blue Green.
${\left[Co(CN{)}_6\right]}^{3-}\Rightarrow$ Pale Yellow.