An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B ?
(b) Identify C and D.
(c) What will be the action of C on litmus solution ? Why ?
(d) State whether element B is a solid, liquid or gas at room temperature.
(e) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Lakhmir Singh Chemistry Class 10
Answers
(a) A is sodium B is chlorine.
(b) C is sodium chloride and D is sodium hydroxide
(c) C will have no effect on litmus solution since it is neutral in nature
(d) B is a gas at room temperature
(e) EB3 or BCl3
Dear Student,
◆ Answers with explanation -
(a) Element A is Sodium (Na) and element B is Chlorine (Cl).
(b) Sodium (A) and chlorine (B) react to give sodium chloride (C).
Na + 1/2 Cl2 --> NaCl
On electrolysis of sodium chloride (C), sodium hydroxide (D) is formed. Gases liberated are H2 and Cl2.
2NaCl + 2H2O --> 2NaOH + H2 + Cl2
(c) Compound C (NaCl), being neutral in nature will have no action on litmus.
(d) Element B (Cl) is gas at room temperature.
(e) Element B (Cl) reacts with element E (Boron) to form boron trichloride.
3Cl2 + 2B --> 2BCl3
Thanks dear..