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प्रश्न
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.
उत्तर
(a) The oxide E2O is basic in nature because it turns red litmus paper blue.
(b) The element E is a metal because metal oxides are basic in nature.
(c) Sodium (Na) is an element like E. It forms the oxide Na2O on reacting with oxygen, which turns red litmus paper blue.
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संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Show the formation of Na2O by the transfer of electrons.
With the help of examples, describe how metal oxides differ from non-metal oxides.
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.
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
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(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
CuSO4(aq) + Fe(s) → FeSO4(aq) + Cu(s)
FeSO4(aq) + Zn(s) → ZnSO4(aq) + Fe(s)
On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
