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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

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B

ii only

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C

i and ii

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D

ii and iii

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Solution

The correct option is D

ii and iii


Reaction of iron with acids: With dilute HCl and dilute H2SO4, it liberates H2 gas.

Fe+2HClFeCl2+H2

Fe+H2SO4FeSO4+H2

With dilute HNO3 in cold condition, it gives ferrous nitrate.

4Fe+10HNO34Fe(NO3)2+NH4NO3+3H2O

With conc. H2SO4, it forms ferric sulphate.

2Fe+6H2SO4Fe2(SO4)3+3SO2+6H2O


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