Metals and Non - metals
(a) Explain why metals usually do not liberate hydrogen gas with dilute nitric acid. (b) Name two metals which can however, liberate hydrogen gas from very dilute nitric acid.
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Single Choice
Iron is rendered passive by treatment with concentrated:
A$$ H_2SO_4 $$
B$$ H_3 PO_4 $$
C$$HCl$$
D$$ HNO_3 $$
Correct Answer
Solution
The inertness exhibited by metals under condition in which chemical activity is expected is known as passivity. The phenomenom of passivity is explained by assuming the formation of a thin film of oxide on the surface of the metal which prevents the action of the regents.
The concentrated nitric acid makes metal such as iron, cobalt, nickel, chromium, aluminium, etc. passive.
SIMILAR QUESTIONS
Metals and Non - metals
(a) What happens when calcium reacts with chlorine? Write an equation of the reaction which takes place. (b) What happens when magnesium reacts with very dilute acid? Write an equation for the reaction involved.
Metals and Non - metals
Very dilute nitric acid reacts with iron to produce hydrogen.
Metals and Non - metals
The metal which reacts with $$HNO_{3}$$ to give five different products depending upon the concentration of the acid is :
Metals and Non - metals
Carbon can reduce copper oxide to copper but not CaO to Ca. Why?
Metals and Non - metals
Pure conc. $$ HNO_3 $$ makes iron passive as the surface is covered with protective layer of
Metals and Non - metals
Iron when treated with concentrated nitric acid
Metals and Non - metals
Hot and conc. nitric acid when reacts with copper, the gas obtained is
Metals and Non - metals
Reaction of zinc with cold and very dilute nitric acid yields
Metals and Non - metals
Zn gives hydrogen gas with $$ H_2SO_4 $$ and $$HCl$$ but not with $$ HNO_3 $$ because
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