TS EAMCET 9 May 2024 Shift 1 Solved Paper

(i) " $\mathrm{Ti}(IV)$ is more stable than $\mathrm{Ti}(III)$ and $\mathrm{Ti}(II)$."True. Among titanium's common oxidation states $(+2,+3,+4)$, the +4 state is generally the most stable due to the high lattice or coordination stabilization and the noble-gas-like configuration of $\mathrm{Ti}^{4+} (3d^0)$.(ii) "Among 3d-series elements ( $Z = 22$ to 29 ), only copper has a positive reduction potential $(\mathrm{M}^{2+} / \mathrm{M}$ )."True. Standard reduction potentials for most 3d metals (like Ti, V, Cr, Mn, Fe, Co, Ni, Zn) are negative. Copper is unique with a standard reduction potential of about +0.34 V , making it the only one in that range with a positive reduction potential for the $\mathrm{M}^{2+} / \mathrm{M}$ couple.(iii) "Both Sc and Zn exhibit +1 oxidation state."False.Sc typically shows +3 oxidation state (it is isoelectronic with Ar when $\mathrm{Sc}^{3+})$. Instances of Sc in +1 or +2 are either extremely rare or not well-established.$\mathrm{Zn}$ commonly shows $+2$. While there are organometallic complexes where Zn can appear in unusual oxidation states, $\mathrm{Zn}(+1)$ is not a stable or typical oxidation state in standard inorganic chemistry contexts.