Advertisements
Advertisements
Question
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ______ on the surface of aluminium.
Advertisements
Solution
Ordinary aluminium strips are not attacked by water because of the presence of a layer of aluminium oxide on the surface of aluminium.
Explanation:
Aluminium is a highly reactive metal that instantly reacts with oxygen in the air to form a thin, tough, and impervious layer of aluminium oxide. This stable oxide film adheres tightly to the metal surface, acting as a protective barrier that prevents water or oxygen from penetrating deeper into the underlying metal. Because of this self-passivating property, ordinary aluminium strips remain unattacked by water under normal conditions. The protective layer is chemically represented as Al2O3.
APPEARS IN
RELATED QUESTIONS
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be ______.
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Name two metals which form amphoteric oxides.
Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
What is the nature of the oxide Na2O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
What is the action of water on sodium? Write the equation of the chemical reaction involved.
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be ______.
The elements whose oxides can turn litmus solution blue are ______.
Name a metal for the given case:
It does not react with cold as well as hot water but reacts with steam.
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
What is the characteristic of the electronic configuration of noble gases?
Write the chemical equation of the above process.
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Find the odd one out:
