Question

take a natural acid say lemon juice in 6 test tubes and add copper, brass, aluminium, iron,zinc,magnesium in separate test tubes and place a matchstick near it. which gas is evolved and what is the observation?
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Answer 1

Answer:

The hydrogen gas is evolved.

Explanation:

The lemon juice is acidic in nature specific citrate. When above minerals are added to it, it form that minerals citrate.