Question 7 of 15beginner🧠 RememberShort Answer2 marks

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Correct Answer

Two metals that displace hydrogen from dilute acids:

  1. Zinc (Zn) - Reacts with dilute hydrochloric acid to produce zinc chloride and hydrogen gas
  2. Iron (Fe) - Reacts with dilute sulphuric acid to produce iron sulphate and hydrogen gas

Two metals that do not displace hydrogen from dilute acids:

  1. Copper (Cu) - Does not react with dilute hydrochloric acid as it is below hydrogen in the activity series
  2. Silver (Ag) - Does not react with dilute acids as it is less reactive than hydrogen

Metals above hydrogen in the reactivity series can displace hydrogen from dilute acids, while metals below hydrogen cannot.

Exercise: EXERCISES | Q: 7 | (Page Page 20)
For More Understanding

Explanation

The chapter explains in Section 3.2.3 that metals react with acids to give a salt and hydrogen gas. The reactivity series shows that metals above hydrogen (K, Na, Ca, Mg, Al, Zn, Fe, Pb) can displace hydrogen from dilute acids. Metals below hydrogen (Cu, Hg, Ag, Au) do not react with dilute acids to produce hydrogen gas. Activity 3.11 demonstrates that magnesium, aluminium, zinc and iron react with dilute HCl, while copper does not.

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