S3-Q3-TE and iron Ch1 All

from the provided graph , the energy of activation and the total energy absorbed by the reaction are ......... & ......... respectively

• A & B

• C & A

• A & C

• B & C

....... is not used to extract iron from heamatite ore.

• Coke

• Carbon monoxide

• Methane gas

• Sulphur trioxide

When heating the iron oxalate in absence of air then heating the product in air ....... is produced.

• Iron (II) oxide

• Magnetic Oxide

• Iron (III) oxide

• Siderite

On adding hot concentrated nitric acid to iron , ......... is formed which cause the passivity.

• iron (II) nitrate only

• iron (II) nitrate and water

• iron (II) nitrate , nitric oxide and water

Reduction of magnetic iron oxide at temperature 400-700 degree celsius gives .......

• Fe

• FeO

• Fe₂O₃

• Fe₃O₄

On adding diluted sulphuric acid to a piece of iron (A) is/are produced but on adding concentrated sulphuric acid to a piece of iron (B) is /are produced.

what is (A) and (B)?

• (A) is Fe₂(SO₄)₃ while (B) is FeSO₄

• (A) is FeSO₄ while (B) is Fe₂(SO₄)₃

• (A) is FeSO₄ while (B) are FeSO₄ & Fe₂(SO₄)₃

• (A) are Fe₂(SO₄)₃ & FeSO₄ while (B) is FeSO₄

When Adding diluted hydrochloric acid to ferro-copper interstitial alloy ...... is /are produced

• Hydrogen gas only

• Red precipitation of Copper

• red precipitation of copper & hydrogen gas

• unpleasant smell of hydrocarbons

Siderite is roasted in air giving ........

• FeO

• Fe₂O₃

• Fe₃O₄

• FeCO₃

X + 3NH4OH ------> Y + 3 NH4CL

Y -----HEAT-----> Z + 3H2O

• X = Fe(OH)₃ Y =FeCl₃ Z=Fe₃O₄

• X = FeCl₃ Y =Fe(OH)₃ Z=Fe₃O₄

• X = FeCl₃ Y =Fe(OH)₃ Z=Fe₂O₃

• X = FeCl₃ Y =Fe(OH)₃ Z=FeO

Which of the following are not coloured ?

• ScCl₃ and TiCl₂

• MnSO₄ and ZnO

• CuCl₂ and ZnO

• ScCl₃ and ZnO