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When zinc metal is treated with a dilute...

When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is used in the hydrogenation of oils. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

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The gas evolved is hydrogen gas which is used in the hydrogenation of oil to produce Vanaspati. The equation of the reaction is given as under
`Zn + 2HCl rarr ZnCl_2+H_2`
Hydrogen gas burns with a pop sound.
`2H_2 + O_2 rarr 2H_2O`
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