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Raney nickel, which is used as a catalyst, is obtained:

1. by grinding solid nickel
2. by treating nickelaluminium alloy with dilute \( N a O H \)
3. by treating nickelaluminium alloy with dilute \( H C l \)
4. by heating nickel tetracarbonyl

Correct answer: by treating nickelaluminium alloy with dilute \( N a O H \)

Solution

Raney nickel is prepared by treating a nickel–aluminium alloy with dilute NaOH, which dissolves aluminium and leaves behind a highly porous nickel catalyst. This porous structure gives it a very large surface area and high catalytic activity.

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