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प्रश्न
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
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उत्तर
When metals react with oxygen, basic oxides are formed. For example, sodium on reacting with oxygen form sodium oxide. This oxide turns red litmus solution to blue, which shows that it is a basic oxide.
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संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Write the electron-dot structures for sodium, oxygen and magnesium.
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Name two metals which form amphoteric oxides.
Name the metal which has been placed at the bottom of the reactivity series.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Complete and balance the following equation:
Na + O2 →
Which of the following elements would yield a basic oxide.
Na, S, C, K, H
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Why is white phosphorus kept immersed under water?
Write the equation for the reaction of Iron with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O
The metals which can produce amphoteric oxides are:
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide
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.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Tungsten wire is used in electric bulbs.
