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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn083

Select the correct statement(s) about sulphuric acid and its reactions.

AHot concentrated $H X_{2} SO X_{4}$ chars sucrose because it acts as a dehydrating agent
BConcentrated $H X_{2} SO X_{4}$ oxidises $NaBr$ to give $Br X_{2}$ and $SO X_{2}$ along with $HBr$ formed initially
CHot concentrated $H X_{2} SO X_{4}$ oxidises copper to $CuSO X_{4}$ with evolution of $SO X_{2}$
DDilute $H X_{2} SO X_{4}$ reacts with copper to liberate dihydrogen

Answer: A, B, C

Conc.

H X_{2} SO X_{4}

removes the elements of water from sucrose leaving carbon, oxidises the HBr formed from NaBr to

Br X_{2}

(itself reduced to

SO X_{2}

), and oxidises Cu on heating to

CuSO X_{4}

with

SO X_{2}

. Copper lies below hydrogen in the electrochemical series, so dilute acid does not liberate

H X_{2}

.

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