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Rusting of Fe is quicker in saline water...

Rusting of `Fe` is quicker in saline water than in ordinary water.

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In saline water, the presence of `Na^(+) and Cl^(-)` ions increases the conductance of the solution in contact with the metal surface. This accelerates the formation of `Fe^(2+)` ion and hence that of rust, `Fe_(2)O_(3).xH_(2)O`
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Rusting of iron is quicker in salline water than in ordinary water. Why is it so?

Corrosion may be defined as the process of slow eating up of a metal by the gases and water vapours present in air due to formation of certain chemical compounds. Corrosion is favoured by the following factors: (i) Position of metal in the reactivity series: Active metals placed above hydrogen in the reactivity series are easily corroded as compared to the metals which are placed below hydrogen. (ii) Air and moisture: The presence of water vapours and gases like CO_(2), SO_(2) etc. in air helps the process of corrosion. (iii) Uneven metal surface: If the surface of metal is uneven, it will have certain depressions. Water drops will stick in these and take part in the chemical process leading to corrosion. (iv) Presence of salts: Presence of salts or electrolytes in water promotes corrosion. For example, rusting of iron is faster in sea water (also called saline water) than in ordinary water or distilled water. Chemically rust is

Knowledge Check

  • Assertion (A) : NaCl is less soluble in heavy water than in ordinary water. Reason (R) : Dielectric constant of ordinary water is more than that of heavy water.

    A
    If both (A) and (R) are correct and (R) is the correct explanation of (A).
    B
    If both (A) and (R) are correct but (R) is not the correct explanation of (A).
    C
    If (A) is correct, but (R) is incorrect.
    D
    If (A) is incorrect, but (R) is correct.

  • It is easier to swim in a sea water than in ordinary water because :

    A
    atmosphere pressure is highest at sea level .
    B
    sea water contains salt .
    C
    density of sea water is higher than that of ordinary water .
    D
    density of sea water is less than that of ordinary water

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    Corrosion may be defined as the process of slow eating up of a metal by the gases and water vapours present in air due to formation of certain chemical compounds. Corrosion is favoured by the following factors: (i) Position of metal in the reactivity series: Active metals placed above hydrogen in the reactivity series are easily corroded as compared to the metals which are placed below hydrogen. (ii) Air and moisture: The presence of water vapours and gases like CO_(2), SO_(2) etc. in air helps the process of corrosion. (iii) Uneven metal surface: If the surface of metal is uneven, it will have certain depressions. Water drops will stick in these and take part in the chemical process leading to corrosion. (iv) Presence of salts: Presence of salts or electrolytes in water promotes corrosion. For example, rusting of iron is faster in sea water (also called saline water) than in ordinary water or distilled water. Following processes are very common for checking rusting of iron

    Corrosion may be defined as the process of slow eating up of a metal by the gases and water vapours present in air due to formation of certain chemical compounds. Corrosion is favoured by the following factors: (i) Position of metal in the reactivity series: Active metals placed above hydrogen in the reactivity series are easily corroded as compared to the metals which are placed below hydrogen. (ii) Air and moisture: The presence of water vapours and gases like CO_(2), SO_(2) etc. in air helps the process of corrosion. (iii) Uneven metal surface: If the surface of metal is uneven, it will have certain depressions. Water drops will stick in these and take part in the chemical process leading to corrosion. (iv) Presence of salts: Presence of salts or electrolytes in water promotes corrosion. For example, rusting of iron is faster in sea water (also called saline water) than in ordinary water or distilled water. Copper and silver get corroded in air by developing a coloured. layer. The colour of the layers respectively is

    Assertion. NaCl is less soluble in heavy water than in ordinary water. Reason. Dielevtric constant of ordinary water is more than that of heavy water.

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    It is difficult to swim in sea water than in river water.

    Rusting of iron becomes quicker in saline medium. Explain.

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