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  4. For the given redox reaction: K2Cr2O7+14HCl arrow 2KCl+2CrCl3+3Cl2+7H2O , what is the equivalent mass of HCl in unit of g/eq. ? Give answer to the nearest integer value after rounding off. [Given: MHCl = 36 . 5 g / mol ]

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Q. For the given redox reaction:
$K_{2}Cr_{2}O_{7}+14HCl \rightarrow 2KCl+2CrCl_{3}+3Cl_{2}+7H_{2}O$ ,
what is the equivalent mass of $HCl$ in unit of $g/eq.$ ? Give answer to the nearest integer value after rounding off. [Given : $M_{HCl} = 36 . 5 g / mol$ ]

NTA AbhyasNTA Abhyas 2022

Solution:

$ K _2 Cr _2 O _7+14 HCl \rightarrow 2 KCl +2 CrCl _3+3 Cl _2 +7 H _2 O$
Here, the $n -$ factor of $K _2 Cr _2 O _7=6$ and the $n -$ factor of $HCl =\frac{3}{7}$.
$\therefore E _{ HCl }=\frac{ M }{\frac{3}{7}}=\frac{7 M }{3}=85.17$
$\simeq 85 \,g / eq$