Atomic number of Mn, Fe and Co are 25,26 and 27 respectively.  Which of the following inner orbital octahedral complex ions are diamagnetic ?

1

(a)

\([Co(NH_3)_6]^{3+}\)

(b)

\([Mn(CN)_6]^{3-}\)

(c)

\([Fe(CN)_6]^{4-}\)

(d)

\([Fe(CN)_6]^{3-}\)

Atomic number of Mn, Fe, Co and Ni are 25, 26, 27 and 28 respectively.  Which of the following outer orbital octahedral complexes have same number of unpaired electrons ?

1

(a)

\([MnCl_6]^{3-}\)

(b)

\([FeF_6]^{3-}\)

(c)

\([CoF_6]^{3-}\)

(d)

\([Ni(NH_3)_6]^{2+}\)

Which of the following options are correct for \([Fe(CN)_6]^{3-}\) complex ?

1

(a)

d ²sp³ hybridisation

(b)

sp³d² hybridisation

(c)

paramagnetic

(d)

diamagnetic

An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl.  This is because............... .

1

(a)

\([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_6]^{4-}\)

(b)

\([Co(H_2O)_6]^{2+}\) is transformed into \([CoCl_2]^{2-}\)

(c)

tetrahedral complexes have smaller crystal field splitting than octahedral complexes.

(d)

tetrahedral complexes have larger crystal field splitting than octahedral complex.

Which of the following complexes are homoleptic ?

1

(a)

\([Co(NH_3)_6]^{3+}\)

(b)

\([Co(NH_3)_4Cl_2]^+\)

(c)

\([Ni(CN)_4]^{2-}\)

(d)

\([Ni(NH_3)_4Cl_2]\)