Which of the following metals are present in Devarda alloy?

C u

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A l

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Z n

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A g

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Solution

The correct options are
A $C u$
B $A l$
C $Z n$

Devarda's alloy is an alloy of aluminium (44% – 46%), copper (49% – 51%) and zinc (4% – 6%).

Devarda's alloy is used as reducing agent in analytical chemistry for the determination of nitrates after their reduction to ammonia under alkaline conditions.
Hence option A,B and C are correct.

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How many of the following metals are extracted by self reduction process?
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Z n (s) + C u {({N O}_{3})}_{2} (a q) \to C u (s) + Z n {({N O}_{3})}_{2} (a q)

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