Question

Identify the correct statement from the following:

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Answer 1

Option $a$: Mond's process is used for purification of $Ni$
Vapour Phase Refining
Step 1:
Ni is heated in stream of $CO$ to form nickel tetracarbonyl
$Ni+4CO\stackrel{330-350K}{\to }\underset{\text{Volatile}}{Ni(CO{)}_4}$
Step2:
Volatile compound is subjected to higher temperature
$Ni(CO{)}_4\stackrel{450-470K}{\to }\underset{\text{Pure metal}}{Ni}+4CO$
Option $2$: The iron obtained from the Blast furnace contains about 4% carbon and many impurities in smaller amounts (e.g., $S,P,Si,Mn$). This is known as pig iron. It can be moulded into a variety of shapes.
Option $3$: Wrought iron is pure iron with 0.1% carbon.
Option $4$: The solid copper obtained has blistered appearance due to evolution of $S{O}_2$. This copper is called blister copper.