Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 3 - Chapter 3 Metals and Non Metals

Question 81 Exercise

(a) What are metals? Name five metals.

(b) Name a metal which is so soft that it can be cut with a knife.

(c) Name the metal which is the best conductor of heat and electricity.

(d) What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.

(e) Write the equations for the reactions of:

(i) Magnesium with dilute hydrochloric acid

(ii) Aluminium with dilute hydrochloric acid

(iii) Zinc with dilute hydrochloric acid

(iv) Iron with dilute hydrochloric acid

Name the products formed in each case. Also indicate the physical states of all the substances involved.


(a) Metals are the elements that conduct electricity, malleable and ductile.

Example: Iron, aluminum etc.

(b) Sodium

(c) Silver

(d) When a metal react with dilute hydrochloric acid, it produces metal chloride and hydrogen gas.

Example: Mg + 2HCl → 2MgCl2 + H2

(e)(i) Mg (s)+ 2HCl (aq)→ 2MgCl2(aq) + H2(g)

(ii) 2Al (s) + 6HCl (aq) → 2AlCl3(aq0 + 3H2(g)

(iii) Zn (s) + 2HCl (aq)→ ZnCl2 (aq)+ H2(g)

(iv) Fe (s)+ 2HCl (aq) → FeCl2(aq) + H2 (g)

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