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Q.

${Na}_{2} {SO}_{3} + HCl \to {Na}_{2} {SO}_{4} + H_{2} O + X$
$X + {Na}_{2} S \overset{Δ}{\to} S + Y; Y + I_{2} ⟶ NaI +' Z'$
‘Z’ is a salt of which oxy acid

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a

$H_{2} {SO}_{8}$

b

$H_{2} {SO}_{4}$

c

$H_{2} {SO}_{5}$

d

$H_{2} S_{4} O_{6}$

answer is C.

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Detailed Solution

${Na}_{2} {SO}_{3} \to_{HCl}^{dil} {Na}_{2} {SO}_{4} + \underset{(X)}{{SO}_{2}} + H_{2} O$

$\underset{(X)}{3 {SO}_{2} + 2 {Na}_{2} S} ⟶ S + \underset{(Y)}{2 {Na}_{2} S_{2} O_{3}}$

$\underset{(Y)}{2 {Na}_{2} S_{2} O_{3} + I_{2}} ⟶ \underset{(Z)}{{Na}_{2} S_{4} O_{6} + 2 NaI}$

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Na2SO3+HCl→Na2SO4+H2O+XX+Na2S→ΔS+Y; Y+I2⟶NaI+'Z'‘Z’ is a salt of which oxy acid