What is O-O bond length in ozone ?

Which of the following ions exhibit same value of spin only magnetic moment?
(A). $\text{Ti}^{3+}$
(B). $\text{Cr}^{3+}$
(C). $\text{Mn}^{2+}$
(D). $\text{Fe}^{3+}$
(E). $\text{Sc}^{3+}$
Choose the most appropriate answer from the options given below.

Which of the following cations in their oxidation states forms colored compounds ?

Which of the following statements is correct with respect to $[\text{Mn(CN)}_6]^{3-}$ ?