Question

Compose an activity to arrange Ca, Mg and Fe metals in the decreasing order of reactivity with water. Write suitable balanced chemical equation and draw diagrams.

CBSE Class X Science LA (5 Marks)

Answer 1

Ans. Taking these metals and when they react with cold or hot water or steam the following observations are done.

Metals Reaction Observation Chemical reaction Ca Cold water Fe3O4 and H2 3Fe + 4H2O Fe3SO4 + H2

Fe Steam Mg(OH)2 and H2 Mg + 2H2O Mg(OH)2 + H2

Mg Hot water Ca(OH)2 and H2 Ca + 2 H2O Ca(OH)2 + H2