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Smelting

Which of the ...

Question

Which of the following metal on reaction with conc. $H N O_{3}$ forms a protective layer of metal (oxide)?

A

C u

only

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B

A l

and

C u

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C

A l

and

F e

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D

F e

only

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Solution

The correct option is D $A l$ and $F e$
Reaction of aluminium or iron with concentrated nitric acid renders it passive by the formation of oxides of aluminium or oxides of iron which acts as a protective layer making further reaction impossible to occur.

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Similar questions

Q. Assetion (A):

A l

shows passivity with conc.

H N O_{3}

A l

forms a protective layer of

A l_{2} O_{3}

H N O_{3}

Z n, F e, C u

A l

are taken and added to the following solutions one by one. The results obtained are tabulated below:

Metal	$Z n S O_{4} (a q)$	$F e S O_{4} (a q)$	$C u S O_{4} (a q)$	$A l_{2} (S O_{4})_{3} (a q)$
$Z n$	-	Displaced	Displaced	No reaction
$F e$	No reaction	-	Displaced	No reaction
$C u$	No reaction	No reaction	-	No reaction
$A l$	Displaced	Displaced	Displaced	-

From the above data, the decreasing order of reactivity of metals is-

Q. Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas?
a.

C u

A l

F e

Z n

What will happen when metals such as Zn, Fe, Cu and Al react with nitric acid?

Q. Arrange the metals in the decreasing order of their reactivity with acids.
Mg, Al, Fe, Cu, Au.

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