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Which of the metals does not corrode in...

Which of the metals does not corrode inspite of favourable standard electrode potential?

A

`Ti`

B

`Al`

C

both (1) and (2)

D

`Fe`

Text Solution

Verified by Experts

The correct Answer is:
C
Aluminium , a very active metal, reacts rapidly with `O_(2)` form the air to form a surface layer of aluminium oxide, `Al_(2)O_(3)`, that is so thin that it is trasparent. This very tough, hard substance is inert to `O_(2), H_(2)O`, and most other corrosive agents in the environment. In this way objects made of `Al` form their own protective layers and need not be treted further to inhibit corrosion. However, acid rain endangers structural `Al` by dissolving this `Al_(2)O_(3)` (amphoteric oxide) coating.
Similarly `Ti` (which is often used to make sports bikes) does not corrode becuase of a hard, impenetrable layer of `TiO_(2)` that adheres to the surgace and protects themetal form further oxidation.
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Knowledge Check

  • Which of the following metals corrodes in moist air

    A
    Au
    B
    Ag
    C
    Ni
    D
    Fe

  • The standard electrode potential is measured by

    A
    Electrometer
    B
    Voltmeter
    C
    Pyrometer
    D
    Galvanometer

  • The temperature defining the standard electrode potential is:

    A
    298 K
    B
    273 K
    C
    373 K
    D
    any temperature can be selected but it must remain constant and species must be in their standard states.

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    The potential associated. with each electrode is known as electrode potential. If the concentration of each species taking part in the electrode reaction is unity (if any gås appears in the electrode reaction, it is confined to 1 atmospheric pressure) and further the reaction is carried out at 298 K, then the potential of each electrode is said to be the standard electrode potential. By convention, the standard electrode potential of hydrogen electrode is 0:0 volt. The electrode potential value for each electrode process is a measure, of relative tendency of the active species in the process to remain in the oxidized / reduced form. A negative E^@ means that the redox couple is a stronger reducing agent than the H^(+)//H_2 couple. A positive E mears that the redox couple is a weaker reducing agent than. the H^(+)//H couple. The metal with greater positive value of standard reduction potentlal forms the oxide of greater thermal stability: Which of the following oxides will be themally most stable?

    The potential associated. with each electrode is known as electrode potential. If the concentration of each species taking part in the electrode reaction is unity (if any gås appears in the electrode reaction, it is confined to 1 atmospheric pressure) and further the reaction is carried out at 298 K, then the potential of each electrode is said to be the standard electrode potential. By convention, the standard electrode potential of hydrogen electrode is 0:0 volt. The electrode potential value for each electrode process is a measure, of relative tendency of the active species in the process to remain in the oxidized / reduced form. A negative E^@ means that the redox couple is a stronger reducing agent than the H^(+)//H_2 couple. A positive E mears that the redox couple is a weaker reducing agent than. the H^(+)//H couple. The metal with greater positive value of standard reduction potentlal forms the oxide of greater thermal stability: Which of the following reactions is not correct?

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