Metallurgy · JEE Main previous year questions

2015 2 questions

1. Q742015 · 4 Apr 2015 · Shift 1

   Which of the following compounds is not colored yellow?

   1. A.${\mathrm{K}}_3[\mathrm{Co}(\mathrm{N}{\mathrm{O}}_2{)}_6]$
   2. B.$(\mathrm{N}{\mathrm{H}}_4{)}_3[\mathrm{As}(\mathrm{M}{\mathrm{o}}_3{\mathrm{O}}_{10}{)}_4]$
   3. C.$\mathrm{BaCr}{\mathrm{O}}_4$
   4. D.$\mathrm{Z}{\mathrm{n}}_2[\mathrm{Fe}(\mathrm{CN}{)}_6]$
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   Answer: D

2. Q872015 · 4 Apr 2015 · Shift 1

   In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

   1. A.$\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ is mixed with $\mathrm{Ca}{\mathrm{F}}_2$ which lowers the melting point of the mixture and brings conductivity
   2. B.$\mathrm{A}{\mathrm{l}}^{3+}$ is reduced at the cathode to form Al
   3. C.$\mathrm{N}{\mathrm{a}}_3\mathrm{Al}{\mathrm{F}}_6$ serves as the electrolyte
   4. D.$\mathrm{CO}$ and $\mathrm{C}{\mathrm{O}}_2$ are produced in this process
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   Answer: C