(a)Why does aluminium not react with water under ordinary conditions?
(b)Name two metals which can displace hydrogen from dilute acids.
(c)Name two metals which cannot displace hydrogen from dilute acids.
(a) Aluminium does not react with water under ordinary conditions because of the presence of a thin layer of aluminium oxide on its surface.
(b) Sodium and magnesium are the two metals that can displace hydrogen from dilute acids.
(c) Copper and silver cannot displace hydrogen from dilute acids.
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- (a)Give one example, with equation, of the displacement of hydrogen by a metal from an acid.(b)Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
- (a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas.(b) Name one metal which does not react with dilute hydrochloric acid.
- 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)?H2SO4HClHNO3All of these
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- From among the set of metals — sodium, zinc, iron, copper, silver, select the following giving equations for each reaction :(a) Two metals which will liberate hydrogen from water.(b) One metal which is used to prepare hydrogen gas in the laboratory.(c) One metal which will displace copper from copper sulphate solution.(d) One metal which will not displace copper from copper sulphate solution.
- Give reasoni. Metals replace hydrogen from dilute acids, whereas non-metals do not.>ii. Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
- Generally, when metals are treated with mineral acids, hydrogen gas is liberated, but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?
- State whether the following statement is true or false:Non-metals react with dilute acids to produce a gas which burns with a pop sound.
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