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State one observation for the followin...

State one observation for the following : A small piece of zinc is added to dilute hydrochloric acid.

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A small piece of zinc is added to dilute hydrochloric acid to give bubbles in solution due to evolution of hydrogen gas.
`Zn(s)+2HCl(aq) to ZnCl_(2)(s)+ H_(2)(g)uarr`
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