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(A): Concentrated nitric acid makes meta...

(A): Concentrated nitric acid makes metal aluminium passive
(R): A protective layer of aluminium oxide is formed on the surface 

A

Both A and R are true, and R is correct explanation of A

B

Both A and R are true, and R is not the correct explanation of A

C

A is true but R is false

D

A is false but R is true

Text Solution

Verified by Experts

The correct Answer is:
A
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Metal protected by a layer of its own oxide is

Concentrated nitric acid can be transported in vessels of aluminium or tin cans. Why ?

Aluminium is stable in air and water inspite of the fact that it is reactive metal. The reason is that a thin film of its oxide, if formed on its surface which makes it passive for further attack. The layer is so useful that in industry, it is purposely deposited by an electrolytric process called anodizing. Reaction of aluminium with oxygen is highyl exothermic and is called thermite reaction 2Al(s)+(3)/(2)O_(2)(g)rarr Al_(2)O_(3)(s), Delta H=-1670 kJ Thermite reaction finds applications in the metallurgical extraction of many metals from their oxides and for welding of metals. The drawback is that to start the reaction, high temperature is required for which an ignition mixture is used. Anodised aluminium is

What type of oxide would Eka-aluminium form ?

Aluminium is stable in air and water inspite of the fact that it is reactive metal. The reason is that a thin film of its oxide, if formed on its surface which makes it passive for further attack. The layer is so useful that in industry, it is purposely deposited by an electrolytric process called anodizing. Reaction of aluminium with oxygen is highyl exothermic and is called thermite reaction 2Al(s)+(3)/(2)O_(2)(g)rarr Al_(2)O_(3)(s), Delta H=-1670 kJ Thermite reaction finds applications in the metallurgical extraction of many metals from their oxides and for welding of metals. The drawback is that to start the reaction, high temperature is required for which an ignition mixture is used. Thermite mixture used for welding is

Aluminium is passive to concentrated nitric acid. Why?

Which metal forms a protective oxide layer to prevent corrosion ?

Which metal forms a protective oxide layer to prevent corrosion ?

Aluminium is a metal belonging to III group of periodic table. So the formula of its oxide is :