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प्रश्न
Fill in the following blank with suitable word:
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ................. on the surface of aluminium.
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उत्तर
Ordinary aluminium strips are not attacked by water because of the presence of a layer of aluminium oxide on the surface of aluminium.
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संबंधित प्रश्न
Write equations for the reactions of calcium and potassium with water.
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
Name the metal which has been placed just below copper in the reactivity series.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Fill in the following blank with suitable word:
The white powder formed when magnesium ribbon burns in oxygen is of ....................
What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place
Name two metals which cannot displace hydrogen from dilute acids.
What is the action of water on magnesium ? Write 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.
What special name is given to substances like aluminium oxide.
Write the equation for the reaction of Aluminium with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
Name one metal which displaces copper from copper sulphate solution and one which does not.
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
Write the chemical equation of the above process.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
The substance that will be flattened on beating with a hammer is ______.
