(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. They are malleable and ductile.
Example: Iron, aluminium, etc.
(b) Sodium is a metal that is so soft that it can be cut with a knife.
(c) Silver is the metal that is the best conductor of heat and electricity.
(d) When a metal reacts with dilute hydrochloric acid, it produces metal chloride and hydrogen.
For Example: $Mg + 2HCl → 2MgCl_2 + H_2$

(e) Following are the equations for the above reactions
(i) $Mg + 2HCl → 2MgCl_2 + H_2$

(ii) $2Al + 6HCl → 2AlCl_3 + 3H_2$

(iii) $Zn + 2HCl → ZnCl_2 + H_2$

(iv) $Fe + 2HCl → FeCl_2 + H_2$
 

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Updated on: 10-Oct-2022

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