JEE Main · ChemistryEasy

$Which of the following reactions represents a redox process?$

A. $NaCl + AgNO_{3} \to AgCl + NaNO_{3}$
B. $HCl + NaOH \to NaCl + H_{2} O$
C. $Zn + 2 HCl \to ZnCl_{2} + H_{2}$
D. $CaO + CO_{2} \to CaCO_{3}$

Show correct answer & step-by-step solution

Correct answer: C — $Zn + 2 HCl \to ZnCl_{2} + H_{2}$

Solution

$In option (C), the oxidation state of Zn changes from 0 to + 2 .$
$The oxidation state of H in HCl changes from + 1 to 0 in H_{2} .$
$Since both oxidation and reduction occur, it is a redox reaction.$
$Hence the answer is (C).$

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