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Iron is rendered passive by treatment wi...

Iron is rendered passive by treatment with concentrated

A

Conc. `HCl`

B

Conc. `HNO_(3)`

C

Conc. `H_(2)SO_(4)`

D

Conc. `H_(3)PO_(4)`

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The correct Answer is:
B
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ERRORLESS -D & P-BLOCK ELEMENTS-Ordinary Thinking (Compounds of d & f block elements)
  1. Manganese achieves its hightest oxidation state in its compound

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  2. Which of the following metal forms an amphoteric oxide

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  3. Iron is rendered passive by treatment with concentrated

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  4. The colour of zinc sulphide is

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  5. Cuprite contains

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  6. Which of the following ions will give a colourless aqueous solution

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  7. Zinc reacts with hot and concetrated H(2)SO(4) to give

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  8. Which metal is electro-deposited on iron surface to prevent rusting

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  9. In which of the following ionic radii of chromium would

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  10. A compound of Zinc which is white in cold state and yellow in hot stat...

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  11. What is the product obtained when MnO(2) solution is boiled with PbO(2...

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  12. Acidified potassium dichromate is treated with hydrogen sulphide. In t...

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  13. The correct formula of permaganic acid is

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  14. The equivalent weight of potassium permanganate in acid solution is

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  15. Which statement is not correct

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  16. In smelting of iron, which of the following reactions takes place in ...

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  17. Colourless solutions of the following four salts are placed separately...

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  18. A group of acidic oxide is

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  19. Silver nitrate on heating gives

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  20. Out of following which compound is used for preservation of wood

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