Advertisements
Advertisements
Question
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
Write the electron-dot structures for sodium, oxygen and magnesium.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Which of the two metals is more reactive: copper or silver?
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
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?
What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
The metals which can produce amphoteric oxides are:
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc
Name a metal which does not react with cold as well as hot water but reacts with steam.
A zinc plate was kept in a glass container having CuSO4 solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.
What are noble gases
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
Why is acidified water considered to be a good conductor of electricity?
