Substance X reacts with dilute HCI violently, V reacts slowly while Z does not react at all. X, Y and Z could be respectively
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Please find below the solution for your asked query:
The reaction between potassium and hydrochloric acid is over very quickly. The potassium immediately ignites on contact with the acid, producing a bright lilac flame that quickly grows until the potassium burns up. Hence, the element X is Potassium (K).
When aluminium is placed in an acid it may initially appear not to react. This is because a layer of aluminium oxide forms on the surface of the aluminium due to prior reaction with the air and acts as a protective barrier. Also,d quickly turns a dull grey colour as aluminium chloride is formed. Also, the metal belongs to moderately reactive metals. The hydrochloric acid quickly turns a dull grey colour as aluminium chloride is formed. Hence, the element Y is Aluminium (Al).
HCl acid does not react with copper. Only those metals whose standard reduction potentials are lower than that of hydrogen react with non-oxidising acids like HCl and dil. H2SO4 , and displace hydrogen from them. Copper has higher reduction potential (more positive) than hydrogen, and it does not react with HCl acid. As shown in image copper is dipped in HCl and there is no reation at all. Hence, the element Z is Copper (Cu).
Therefore, option (4) is correct.
Hope this helps!
Regards
Please find below the solution for your asked query:
The reaction between potassium and hydrochloric acid is over very quickly. The potassium immediately ignites on contact with the acid, producing a bright lilac flame that quickly grows until the potassium burns up. Hence, the element X is Potassium (K).
When aluminium is placed in an acid it may initially appear not to react. This is because a layer of aluminium oxide forms on the surface of the aluminium due to prior reaction with the air and acts as a protective barrier. Also,d quickly turns a dull grey colour as aluminium chloride is formed. Also, the metal belongs to moderately reactive metals. The hydrochloric acid quickly turns a dull grey colour as aluminium chloride is formed. Hence, the element Y is Aluminium (Al).
HCl acid does not react with copper. Only those metals whose standard reduction potentials are lower than that of hydrogen react with non-oxidising acids like HCl and dil. H2SO4 , and displace hydrogen from them. Copper has higher reduction potential (more positive) than hydrogen, and it does not react with HCl acid. As shown in image copper is dipped in HCl and there is no reation at all. Hence, the element Z is Copper (Cu).
Therefore, option (4) is correct.
Hope this helps!
Regards