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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 3pn162

Which of the following statements about concentrated sulphuric acid is/are correct?

ACold dilute $H X_{2} SO X_{4}$ oxidises copper to $CuSO X_{4}$ with evolution of $H X_{2}$ .
BIt dehydrates formic acid to carbon monoxide on warming.
CIt liberates HCl from sodium chloride because it is non-volatile.
DHot concentrated $H X_{2} SO X_{4}$ oxidises copper, being reduced to $SO X_{2}$ .

Answer: B, C, D

HCOOH CO + H X_{2} O

(H2SO4 as dehydrating agent),

Cu + 2 H X_{2} SO X_{4} CuSO X_{4} + SO X_{2} + 2 H X_{2} O

and

NaCl + H X_{2} SO X_{4} NaHSO X_{4} + HCl

are standard. Copper is below hydrogen in the electrochemical series and does not react with dilute H2SO4, so the last statement is false.

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