Metals and Non-metals NCERT Solution, study material, CBSE Notes

NCERT Solution: Metals and Non-metals

An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also, write down the equations for the reactions involved.

A is sodium. B is chlorine (atomic number 17). C is sodium chloride and D is sodium hydroxide.

2 Na + Cl₂ → NaCl

Electrolysis of sodium chloride can be given by following equation:

2NaCl +2 H₂O → 2NaOH + Cl₂ + H₂

Two ores A and B were taken. On heating ore A gives CO₂whereas, ore B gives SO₂. What steps will you take to convert them into metals?

When a carbonate ore is heated, we get carbon dioxide. A carbonate ore is calcinated to obtain oxide of the metal. Following equation shows calcinations of zinc carbonate.

ZnCO₃ + ZnO → CO₂

When a sulphide ore is roasted, we get Sulphur dioxide. Zinc sulphide is roasted to obtain zinc oxide.

2ZnS + 3O₂ → 2ZnO + 2SO₂

After any of the above steps; zinc oxide is reduced to obtain pure zinc.

ZnO + C → Zn + CO