Question

An element A burns with golden flame in air . It reacts with another element B , atomic no. 17 to give a product C. An aqueous solution of product C on elctrolysis gives a compound D and liberates hydrogen. IDENTIFY A,B,C,D . ALSO WRITE DOWN THE EQUATIONS FOR THE REACTIONS INVOLVED

Answer 1

 A is sodium (burns with golden flame), B is chlorine (atomic number 17), C is sodium chloride and D is sodium hydroxide.

When sodium reacts with chlorine, it gives sodium chloride.

Na + Cl ⇨ NaCl

Electrolysis of sodium chloride gives sodium hydroxide.

2NaCl + 2H2O ⇨ 2NaOH + Cl2 + H2