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Four set ups as given below were arranged to identify the gas evolved when dilute hydrochloric acid was added to zinc granules. The most appropriate set up is :
(1) I
(2) II
(3) III
(4) IV"
Correct answer: (4) IV
Explanation: When zinc is treated with dilute hydrochloric acid, hydrogen gas is liberated from the solution. Only from setup 4 hydrogen gas can be easily evolved.
The chemical equation for the reaction is given below:
$Zn(s) + 2HCl (aq) → ZnCl_2 (aq) + H_2(g)$
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