Question

Arrange sodium ,iron and calcium based on the reactivity with oxygen and water . Write relevant chemical equation

Answer 1

Answer:

Explanation:

The answer of this question can be given in terms of reactivity series of metals. A metal which is more reactive reacts with oxygen rapidly or with cold water. As the reactivity of metal decrease we need to either increase the temperature of reacting mixture or increase the temperature of water ( use of hot water instead of cold water)

The reactivity series of the metals in order of decreasing reactivity is given by:

Potassium

Sodium

Calcium

Magnesium

Aluminium

Zinc

Iron

Tin

Lead

Copper

Silver

Gold

Platinum

From the list above, we can see that sodium is the most reactive followed by calcium and iron which is least reactive of three.

The reaction of the metals is given below:

REACTION WITH OXYGEN

(i) Sodium:

4 Na + O₂ ⇒ 2 Na₂O

(ii) Calcium

 2 Ca  + O₂⇒  2 CaO

(iii) Iron

 Fe + O₂ ⇒ Fe₂O₃

REACTION WITH WATER

(i) Sodium:

2 Na + 2 H₂O ⇒ 2 NaOH + H₂

(ii) Calcium (with hot water)

 2 Ca  + H₂O ⇒  2 CaOH  + H₂

(iii) Iron (with steam)

 2 Fe + 3 H₂O ⇒ Fe₂O₃ + 3 H₂

Answer 2

Explanation:

sodium,iron nd calcium carbonate is the answer