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Q.

Zinc metal is not a constituent in the alloy

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a

Brass

b

Bronze

c

Gun metal

d

Devarda’s alloy

answer is B.

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Detailed Solution

A copper and zinc alloy is called brass. 
A copper and tin alloy is called bronze.
A copper, tin and zinc alloy is called gun metal.
A aluminium, copper and zinc alloy is called Devarda's alloy.
Therefore, only bronze does not constitute of zinc.
Hence , (B) bronze is the correct answer.

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