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प्रश्न
Why are metals called electropositive elements?
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उत्तर
Metals are known as electropositive elements because they can form positive ions by losing electrons.
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संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Why is sodium kept immersed in kerosene oil?
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
Name two metals which form amphoteric oxides.
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
Name the metal which has been placed at the bottom of the reactivity series.
Complete and balance the following equation:
\[\ce{Cu(NO3)2_{(aq)} + Zn_{(s)} ->}\]
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ______ on the surface of aluminium.
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
A copper plate was dipped in AgNO3 solution. After certain time, silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved.
What is the action of water on magnesium ? Write equation of the chemical reaction involved.
What is the action of water on aluminium ? Write equation of the chemical reaction involved.
A basic oxide will be formed by the element:
(a) K
(b) S
(c) P
(d) Kr
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
Which of the following reactions will not occur? Why not?
(a) MgSO4 (aq) + Cu (s) → CuSO4 (aq) + Mg (s)
(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)
(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg (s)
Arrange the following metals in the increasing order of their reactivities:
Copper, Zinc, Aluminium, and Iron
