5.1 Redox: Rusting

What element rusts?

• carbon

• manganese

• iron

• potassium

Tags

NGSS.MS-PS1-1

What is the chemical name given to Rust ?

• hydrated iron(I) oxide

• Iron (I) oxide

• iron(II) hydroxide

• hydrated iron(III) oxide

Which of the following does not prevent rusting of iron?

• Painting , Oiling , Galvinising

• Attach to a piece of copper

• connect to a piece of magnesium with wire

• cover entirely with copper

In which tube will the nail go rusty?

• The nail in tube A will go rusty.

• The nail in tube B will go rusty.

• The nail in tube C will go rusty.

Tags

NGSS.MS-PS1-2

What metal from the list below does not corrode ?

• Iron

• Steel

• Gold

• Magnesium

The diagram shows mechanism of rust formation.

Choose the correct statement:

• an iron atom release two electrons to form an iron(II) ion

• an iron(II) ion receives two electron from an iron atom

• an oxygen molecules receives two electrons to form hydroxide ion

• four hydroxide ions are formed when two water molecules receive four electrons

During rusting, the iron block also works as a voltaic cell.

Which of the following statements explain this

• there is water present

• metal iron is present

• iron atom loses electrons to oxygen and water

• iron block is corroded when in contact with oxygen and water

Diagram shows a voltaic cell on the iron block during rusting.

which of the following reaction occurs at cathode?

• Fe --> Fe²⁺ + 2e

• Fe²⁺ + 2e --> Fe

• O₂ + 2H₂O + 4e --> 4OH^-

• 4OH^- --> O₂ + 2H₂O + 4e

Which of the test tube(s) in Diagram will iron nail rust?

• X only

• Y only

• X and Z only

• Y and Z only

Which metal container causes the iron nail to corrode fastest?

• Magnesium

• Silver

• Lead

• Tin