Sodium halides are warmed with concentrated H2SO4. Select all correct statements.

NaI gives I2, and the acid is reduced as far as H2S.

NaCl gives HCl only; chloride is not oxidised.

NaBr gives HBr, part of which is oxidised to Br2 with formation of SO2.

NaI gives I2, and the acid is reduced as far as H2S.

NaCl gives HCl only; chloride is not oxidised.

NaBr gives HBr, part of which is oxidised to Br2 with formation of SO2.

JEE Main levelOne or more correct optionsDifficulty 2 of 3qa138

Sodium halides are warmed with concentrated $H X_{2} SO X_{4}$ . Select all correct statements.

A $NaI$ gives $I X_{2}$ , and the acid is reduced as far as $H X_{2} S$ .
B $NaCl$ gives $HCl$ only; chloride is not oxidised.
C $NaBr$ gives $HBr$ , part of which is oxidised to $Br X_{2}$ with formation of $SO X_{2}$ .
D $NaCl$ gives mainly $Cl X_{2}$ and $SO X_{2}$ .

HCl is a poor reducing agent, so chloride gives only

HCl

HBr

reduces the acid to

SO X_{2}

and

HI

, being a stronger reductant, reduces it to

H X_{2} S

(

8 HI + H X_{2} SO X_{4} 4 I X_{2} + H X_{2} S + 4 H X_{2} O

). The last statement is wrong.