Among the following unbalanced chemical equation is

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$H_{2(g)} + C l_{2(g)} \to HC l_{(g)}$

${2Mg}_{(s)} + O_{2(g)} \to {2MgO}_{(s)}$

$H_{2(g)} + O_{2(g)} \to H_{2} O_{(l)}$

$N_{2(g)} + {3H}_{2(g)} \overset{200 a t m, 450 ° C}{\to} {2NH}_{3(g)}$

answer is A, D.

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Detailed Solution

In a balanced chemical equation, the total no. of atoms present in the left hand side of the chemical equation is equal to total no. of atoms present in the right hand side of the chemical equation. But in the given question unbalanced chemical equations are,

$H_{2(g)} + O_{2(g)} \to H_{2} O_{(l)}$

Question Image Unbalanced.

$H_{2(g)} + C l_{2(g)} \to HC l_{(g)}$

Unbalanced.

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