JEE Main 2024 · Chemistry · d- and f-Block Elements and Metallurgy · easy

Consider: (I) Self-reduction of copper sulphide ore in a Bessemer converter gives blister copper. (II) Zone refining is used to obtain ultrapure Ge…

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Consider: (I) Self-reduction of copper sulphide ore in a Bessemer converter gives blister copper. (II) Zone refining is used to obtain ultrapure Ge and Si. (III) In the van Arkel method crude Ti or Zr is converted to a volatile iodide which decomposes on a hot tungsten filament. (IV) In the Mond process nickel carbonyl is formed at

450

470\ \mathrm{K}

and decomposed at

330

350\ \mathrm{K}

. The number of correct statements is

A. $3$
B. $4$
C. $2$
D. $1$

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Answer: (A) $3$

(I), (II) and (III) are correct. In (IV) the temperatures are interchanged:

\mathrm{Ni+4CO\to Ni(CO)_4}

occurs at the lower temperature (

330

350\ \mathrm{K}

) and the carbonyl decomposes to pure nickel at the higher temperature (

450

470\ \mathrm{K}

). So three statements are correct.

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