Question

Assertion: Nickel can be purified by Mond process.

Reason: $Ni\left(CO\right)4$ is a volatile compound which decomposes at $460K$ to give pure $Ni$.

• A. Assertion is false but reason is true.
• B. Assertion is true but reason is false.
• C. Both assertion and reason are true but reason is not the correct explanation of assertion.
• D. Both assertion and reason are true and reason is the correct explanation of assertion.
• E. Assertion and reason both are wrong.

Answer 1

The correct option is D Both assertion and reason are true and reason is the correct explanation of assertion.

$\text{Assertion}$

• Nickel can be purified by the Mond process. In this process, nickel is heated in a stream of Carbon Monoxide forming a volatile complex named Nickel Tetracarbonyl.

$Ni+4CO\stackrel{330-350K}{\to }Ni(CO{)}_4$

So, the assertion is correct.

$\text{Reason}$

This complex is decomposed at higher temperature to obtain pure metal.

$Ni+4CO\stackrel{330-350K}{\to }Ni(CO{)}_4$

So, reason is correct and it also explains assertion.

Hence, both assertion and reason are true and reason is the correct explanation of assertion.