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Give the composition of Devarda's alloy....

Give the composition of Devarda's alloy. Which gas is evolved when it reduces nitrates in alkaline solutions?

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Devarda's alloy contains Al (44%-46%), Cu(49%-51%) and Zn (4%-6% ). In alkaline solutions, it reduces nitrates to give ammonia quantitatively.
`4Zn+NO_(3)^(-)+7OH^(-)+6H_(2)Oto4Zn(OH)_(4)^(2-)+NH_(3)uarr`
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