The metal which react with cold water, boiled water and steam to produce H2 respectively are:
O Na, Ca, Al
O Na, Mg, Fe
O Na, Mg, Ca
O Na, Ca, Fe
Answers
Explanation:
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.