Question

Explain the reaction of Na and K with water with the reactions

involved. Write the reactivity series of elements. What happens when

steam is passed over Aluminium show the reaction involved​

Answer 1

↪Reaction of metals with water:↩

⚪Metals form respective metal hydroxide and hydrogen gas when they react with water.

⚪Metal + Water ⇨ Metal hydroxide + Hydrogen Most of the metals do not react with water.

⚪However, alkali metals react vigorously with water.

⚪Reaction of sodium metal with water: Sodium metal forms sodium hydroxide and liberates hydrogen gas along with lot of heat when it reacts with water.

⚪Na + H2O ⇨ NaOH + H2

↪Reaction of potassium metal with water:↩ 

⚪Potassium metal forms potassium hydroxide and liberates hydrogen gas along with lot of heat when it reacts with water.

⚪K + H2O ⇨ KOH + H2

⚪Reaction of calcium metal with water: Calcium forms calcium hydroxide along with hydrogen gas and heat when it reacts with water.

⚪Ca + 2H2O ⇨ Ca(OH)2 + H2

↪Reaction of magnesium metal with water: ↩

⚪Magnesium metal reacts with water slowly and forms magnesium hydroxide and hydrogen gas.

⚪Mg + 2H2O ⇨ Mg(OH)2 + H2

⚪When steam is passed over magnesium metal, magnesium oxide and hydrogen gas are formed.

⚪Mg + H2O ⇨ MgO + H2

↪Reaction of aluminium metal with water:↩ 

⚪Reaction of aluminium metal with cold water is too slow to come into notice.

⚪But when steam is passed over aluminium metal; aluminium oxide and hydrogen gas are produced.

⚪2Al + 3H2O ⇨ Al2O3 + 2H2

↪Reaction of zinc metal with water: ↩

⚪Zinc metal produces zinc oxide and hydrogen gas when steam is passed over it. Zinc does not react with cold water.

⚪Zn + H2O ⇨ ZnO + H2

↪Reaction of Iron with water:↩

⚪Reaction of iron with cold water is very slow and come into notice after a long time.

⚪Iron forms rust (iron oxide) when reacts with moisture present in atmosphere.

⚪Iron oxide and hydrogen gas are formed by passing of steam over iron metal.

⚪3Fe + 4H2O ⇨ Fe3O4 + 4H2

↪Other metals usually do not react with water or react very slowly.↩

Hope this⤴️will help u