Download App

General Principles and Processes of Isolation of Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryGeneral Principles and Processes of Isolation of Elements3 Marks
Question
Describe a method for refining nickel.
✓

Answer

Nickel is refined by Mond's process. In this process, nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, which is a volatile complex.
$\text{Ni}+4\text{C}\text{O}\xrightarrow[]{\ \ \ 330-350\text{k}\ \ \ }\text{Ni}(\text{C}\text{O})_4\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Nickel tetracarbonyl}$
Then, the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature (450 - 470K) to obtain pure nickel metal.
$ \begin{matrix}\text{Ni}(\text{C}\text{O})_4& \xrightarrow[]{\ \ \ 330-350\text{k}\ \ \ }&\text{Ni}+4\text{CO} \\\text{Nickel tetracarbonyl}&&\text{Nickle}\ \ \ \ \ \ \ \ \ \ \ \ \ \end{matrix}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from General Principles and Processes of Isolation of Elements→General Principles and Processes of Isolation of Elements — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A solution contains 1g mol. each of p-toluene diazonium chloride and pnitrophenyl diazonium chloride. To this 1g mol. of alkaline solution of phenol is added. Predict the major product. Explain your answer.
→
Calculate the mass of urea $(NH_2CONH_2)$ required in making $2.5$ kg of $0.25$ molal aqueous solution.
→
a. What is a ligand? Give an example of a bidentate ligand.
b. Explain as to how the two complexes of nickel, $\left[ Ni ( CN )_4\right]^{2-}$ and $Ni ( CO )_4$, have different structures but do not differ in their magnetic behaviour. $( Ni =28)$.
→
Write the mechanism of acid dehydration of ethanol to yield ethane.
→
How would you account for the following:
Transition metals sometimes exhibit very low oxidation state such as $+1$ and $0$.
→
What is carbonyl group? Give information about the functional groups containing carbonyl group with their structures.
→
$SF_6$ is known but $SCl_6$ is not. Why?
→
Complete the following chemical equations:
  1. $\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}+6 \mathrm{Fe}^{2+}+14 \mathrm{H}^{+} \rightarrow$
  2. $2 \mathrm{CrO}_4^{2-}+2 \mathrm{H}^{+} \rightarrow$
  3. $2 \mathrm{MnO}_4^{-}+5 \mathrm{C}_2 \mathrm{O}_4{ }^{2-}+16 \mathrm{H}^{+} \rightarrow$
→
Give three points of difference between physisorption and chemisorption.
→
State the preparation, properties and uses of methanol.
→