Write the following chemical properties of of metals on :
(i) Action of acids
(ii) Action of bases
(iii)Displacement reactions
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Write the following chemical properties of of metals on :
(i) Action of acids
(ii) Action of bases
(iii)Displacement reactions
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Answer:
1. When a metal reacts with an acid, it generally displaces hydrogen from the acids. This leads to the evolution of hydrogen gas. The metals combine with remaining part of acids to form a salt. For example reaction of sulphuric acid with zinc.
H2SO4 + Zn → ZnSO4 + H2
2.Alkalis (bases that are soluble in water) react with the metal to produce salt and hydrogen gas. For example reaction of zinc with sodium hydroxide.
2 NaOH + Zn → Na2ZnO2 + H2
3.Displacement reactions involve a metal and a compound of a different metal. In a displacement reaction:
a more reactive metal will displace a less reactive metal from its compounds
Displacement reactions are easily seen when a salt of the less reactive metal is in the solution. During the reaction:
the more reactive metal gradually disappears as it forms a solution
the less reactive metal coats the surface of the more reactive metal
For example, magnesium is more reactive than copper. When a piece of magnesium is dipped into blue copper sulfate solution:
the blue colour fades as colourless magnesium sulfate solution forms
brown copper coats the surface of the magnesium
Magnesium powder is added to blue copper sulfate solution and when stirred, they change into a colourless magnesium sulfate solution and copper powder.
Here are the equations for the reaction:
magnesium + copper sulfate → magnesium sulfate + copper
Mg + CuSO4 → MgSO4 + Cu
No reaction is seen if you do things the other way round – in other words, if you put copper powder into magnesium sulfate solution. This is because copper is not reactive enough to displace magnesium from magnesium sulfate.
Explanation:
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