Match the following
| List I (Industrial process) | List II (Catalyst used) |
| A Ostwald's process | I $\mathrm{CuCl}_2$ |
| B Haber's process | II Zeolites |
| C Deacon's process | III Pt gauge |
| D Cracking of hydrocarbons | IV Fe |
The correct answer is
Observe the following $f$-block elements
$\mathrm{Eu}(Z=63) ; \mathrm{Pu}(Z=94) ; \mathrm{Cf}(Z=98)$;
$\operatorname{Sm}(Z=62) ; \mathrm{Gd}(Z=64) ; \mathrm{Cm}(Z=96)$
How many of the above have half-filled $f$-orbitals in their ground state?
$Y$ in the given sequence of reactions is
$$ \begin{gathered} \mathrm{P}_4+x \mathrm{NaOH}+y \mathrm{H}_2 \mathrm{O} \xrightarrow{\mathrm{CO}_2} X+z \mathrm{NaH}_2 \mathrm{PO}_2 \\ X+\mathrm{CuSO}_4 \longrightarrow Y+\mathrm{H}_2 \mathrm{SO}_4 \end{gathered} $$
Identify the correct statements from the following.
(i) Ti (IV) is more stable than Ti (III) and Ti (II).
(ii) Among $3 d$-series elements (From $Z=22$ to 29). Only copper has positive reduction potential $\left(M^{2+} / M\right)$.
(iii) Both Sc and Zn exhibit +1 oxidation state.