Column - I (Complex)		Column - II (Expected Colour)
p)	${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\left(\mathrm{en}\right)\right]}^{2+}$	i)	Green
q)	${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_2(\mathrm{en}{)}_2\right]}^{2+}$	ii)	Violet
r)	${\left[\mathrm{Ni}(\mathrm{en}{)}_3\right]}^{2+}$	iii)	Blue/Purple
s)	${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$	iv)	Pale blue
		v)	Colourless

	p	q	r	s
1	iv	iii	ii	i
2	i	ii	iii	v
3	iv	iii	i	ii
4	v	iii	ii	i