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Iron is rendered passive by treatment wi...

Iron is rendered passive by treatment with

A

`H_2SO_4` is a strong oxidising agent and it reacts with `KMnO_4` during titration

B

`H_3PO_4`

C

`HCl`

D

conc. `HNO_3`

Text Solution

Verified by Experts

The correct Answer is:
d
Iron on reaction with conc. `HNO_3` is covered with oxide film `(Fe_2O_3)` and is rendered passive.
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Give reasons for the following : (i) Carbonate and sulphide ores are converted into oxides before reduction. (ii) Aluminium is rendered passive when it is dipped in conc. HNO_(3) (iii) Nonmetals do not displace hydrogen from acids. (iv) An aqueous solution of CuSO_(4) cannot be stored in an iron vessel. (v) The surface of some metals become dull when left exposed to air for a long time.

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Knowledge Check

  • Iron is rendered passive by the action of

    A
    Conc. `H_(2)SO_(4)`
    B
    Conc. `H_(3)PO_(4)`
    C
    Conc. `HCl`
    D
    Conc. `HNO_(3)`

  • Which fo the following metal is rendered passive by the action of highly concentrated nitric acid (~80%)?

    A
    `Fe`
    B
    `Al`
    C
    `Ni`
    D
    All of these

  • Which of the following is rendered passive by conc. HNO_(3) is

    A
    Al
    B
    Au
    C
    Zn
    D
    Sn

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