Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	Nickel can be purified by Mond’s process.
Reason (R):	It is a volatile compound that decomposes at 460 K to give pure Ni.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Volatile compound is decomposed at a higher temperature to obtain pure metal

In this process, nickel is heated in a stream of carbon monoxide forming a volatile complex named nickel tetracarbonyl. This complex is decomposed at a higher temperature to obtain pure metal.

The reaction is as follows:

Ni + 4CO

\overset{330}{\to}

-

350

K

Ni(CO)₄

Ni(CO)_{4 $\overset{450}{\to}$ $-$ $470$ $K$}Ni + 4CO

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