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In which of the following equations the product formed has similar oxidation state for nitrogen?
(i) \( \mathrm{NH}_{4} \mathrm{NO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{N}_{2} \mathrm{O}+2 \mathrm{H}_{2} \mathrm{O} \)
(ii) \( 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \stackrel{673 \mathrm{~K}}{\longrightarrow} 4 \mathrm{NO}_{2}+2 \mathrm{PbO}+\mathrm{O}_{2} \)
(iii) \( 4 \mathrm{HNO}_{3}+\mathrm{P}_{4} \mathrm{O}_{10} \longrightarrow 4 \mathrm{HPO}_{3}+2 \mathrm{~N}_{2} \mathrm{O}_{5} \)
(iv) \( 2 \mathrm{NO}_{2} \underset{\text { Heat }}{\stackrel{\text { Cool }}{\rightleftharpoons}} \mathrm{N}_{2} \mathrm{O}_{4} \)
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (v)
(d) (iii) and (iv)
\( \mathrm{P} \)
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