Formation of \( \mathrm{Ni}(\mathrm{CO})_{4} \) and subsequent its decomposition into \( \mathrm...

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Formation of \( \mathrm{Ni}(\mathrm{CO})_{4} \) and subsequent its decomposition into \( \mathrm{Ni} \) and \( \mathrm{CO} \) makes basis of Mond's process ; \( \mathrm{Ni}+4 \mathrm{CO} \stackrel{T_{1}}{\longrightarrow} \mathrm{Ni}(\mathrm{CO})_{4} \stackrel{T_{2}}{\longrightarrow} \mathrm{Ni}+4 \mathrm{CO}, T_{1} \) and \( T_{2} \) are :
(a) \( 100^{\circ} \mathrm{C}, 50^{\circ} \mathrm{C} \)
(b) \( 50^{\circ} \mathrm{C}, 100^{\circ} \mathrm{C} \)
(c) \( 50^{\circ} \mathrm{C}, 230^{\circ} \mathrm{C} \)
(d) \( 230^{\circ} \mathrm{C}, 50^{\circ} \mathrm{C} \)
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