Question

Which of the following statement(s) is/are correct when iron reacts with concentrated sulphuric acid?

i. Hydrogen gas is released.

ii. The compound formed is ferric sulphate.

iii. Sulphur dioxide gas is released.

• A. i only
• B. ii only
• C. i and ii
• D. ii and iii

Answer 1

The correct option is D

ii and iii

Reaction of iron with acids: With dilute HCl and dilute $H_{2}S{O}_4$, it liberates $H_2$ gas.

$Fe+2HCl\to FeC{l}_2+H_2\uparrow$

$Fe+H_{2}S{O}_4\to FeS{O}_4+H_2\uparrow$

With dilute $HN{O}_3$ in cold condition, it gives ferrous nitrate.

$4Fe+10HN{O}_3\to 4Fe(N{O}_3{)}_2+N{H}_{4}N{O}_3+3H_{2}O$

With conc. $H_{2}S{O}_4$, it forms ferric sulphate.

$2Fe+6H_{2}S{O}_4\to F{e}_2(S{O}_4{)}_3+3S{O}_2+6H_{2}O$